One Sabbath Day, at the beginning of Jesus’ ministry, he walked into a synagogue in Capernaum and began to teach the assembled worshipers. There was nothing unusual about that, per se. It happened virtually every time the synagogue was in session. But what Jesus of Nazareth said, and the inexplicable authority that accompanied him and his words, left the people awestruck, even fearful.
How did that man of Galilee acquire such profound knowledge and power? This sermon answers that question: He is divine. Omniscient. A man fully human and fully God, with knowledge of every fact—past, present, and future.
Jesus’ omniscience is amazing, indeed, and this sermon discusses it. But what does it mean for us in day-to-day life?
It means that you are fully known and still fully loved; that you are never forgotten, and your needs are never overlooked; also you are led by one who cannot be wrong, and will always lead you right; you are secure in a Savior who knows the end from the beginning; and you are under the watchful eye of God who judges right, always does what is right, and will always do what is for your best benefit.
Read the full sermon transcript below!
This morning, we turn again to our journey through the Gospel of Mark. The great theme that runs through all four Gospels—Matthew, Mark, Luke, and John—is this: to proclaim the good news that God’s kingdom of salvation has entered the world, and to present Jesus as the long-awaited Messiah, the Christ of God, who came to redeem us from the ruin of sin and all its dreadful consequences. He came to save, to lead his people home to heaven, and one day to return in triumph to a redeemed and restored creation.
Mark’s burden is clear. He writes to persuade us that Jesus is indeed the Savior and the Messiah. And so, in the opening chapters, he sets before us the authority of the Son of God—authority to save, authority to command, authority over every power that exists in this world. In the first chapter, verses 21 through 34, Mark draws our attention to three great realms where Christ’s authority is on full display.
First, he shows us Jesus’ authority over the highest forms of human knowledge. Second, he reveals his authority over the spiritual realm—over Satan himself and all his demonic hosts. And third, he displays Christ’s authority over the physical world, as the Lord heals the diseased body of Simon Peter’s mother-in-law.
These three—knowledge, the spiritual realm, and the physical realm—embrace all of creation. They encompass all that is—and can be—known and experienced. And over them all stands Jesus Christ, supreme and sovereign. This morning, we will fix our hearts and minds on the first of these: the authority and supremacy of Jesus over all human knowledge.
Christ’s Authority Over the Realm of Knowledge
After Jesus called his first four disciples, as we considered last Lord’s Day, he and they went to the town of Capernaum. On the Sabbath Day, Jesus went into the synagogue and began to teach (vv. 21-22): 21 Then they went into Capernaum, and immediately on the Sabbath He entered the synagogue and taught. 22 And they were astonished at His teaching, for He taught them as one having authority, and not as the scribes.
The first thing Mark brings to our attention is this: the knowledge and teaching of Jesus towered above that of the Jewish religious leaders. His teaching was not like that of the scribes.
The Jews took great pride in their intellect, knowledge, and education. The most elite Jewish teachers were the rabbis. Jesus was called by that same title—rabbi—yet he was a rabbi unlike any other among those super-educated men.
What exactly was a rabbi, and how did a man get to be one? The word rabbi means master. Rabbis were regarded as the spiritual masters of Israel. As one writer describes, they were not only experts in the Torah—the Scriptures of their day—but also living examples of what it meant to walk with God. They were the ones who seemed to shine with a kind of inner light.
Every rabbi had his yoke. That word was a Hebrew idiom for his particular set of teachings—his way of reading the Scriptures, his interpretation of how live a godly life in God’s world. And so, later in Jesus’ ministry, when he invited the people to take his yoke upon them—“Come to me, all you who labor and are heavy laden, and I will give you rest. Take my yoke upon you and learn from me…”—he was speaking in the language of a rabbi. He was offering people the opportunity to learn from him—to take up his yoke and to learn his own teaching, his way of reading the Word of God, and his perspective on living life under God’s rule.
The Jewish people placed an extraordinarily high value on education. From the time a child was five years old, he was enrolled in the local school—often built alongside the synagogue and taught by a full-time scribe. That school was called the Bet Sefer—literally, “the House of the Book.” And rightly so, for there the child was immersed in the Scriptures.
By the age of twelve or thirteen, children were expected to have memorized the entire Torah—the first five books of the Bible: Genesis, Exodus, Leviticus, Numbers, and Deuteronomy. Then they could have their bar mitzvah for boys or bat mitzvah for girls, recognizing their entry into adulthood.
Then the best and brightest of these students could continue to a second level of education called the Bet Midrash—“the House of Learning.” And there, by the age of seventeen, they would have memorized— are you ready for this? —the entire Old Testament! From Genesis to Malachi, word for word, committed to memory, and able to recite it!
By that point, most had completed their education and were told to “go and get married [if they weren’t already], have children, and carry on with your family’s traditional trade,” whatever it might be. But the best of the best of the best—the most brilliant and able of all young people—could apply to apprentice under a rabbi.
If chosen, they became disciples of their rabbi, living with him, learning his teaching, taking upon themselves his yoke. At age thirty, if the rabbi under whom they had apprenticed approved and recommended them, those disciples could become rabbis.
Nearly thirty years of learning before they received their full credentials! Rabbis were the equivalent of—and maybe beyond—our Ph D. Can you see why the Jewish people had such profound respect for these men? They were stunningly brilliant! The greatest scholars in the world!
Into that environment—and environment steeped in piety, saturated with learning, and marked by the highest reverence for education—there stepped a man from a small, out-of-the-way town. His name was Jesus of Nazareth. Mark tells us in verse 21: And immediately on the Sabbath he entered the synagogue and taught.
And how did the congregation and its leaders react? Mark describes them as “astonished.” Can you picture it? Wide-eyed, mouths hanging open, sitting in stunned silence. Mark explains: They were astonished at his teaching, for he taught them as one having authority, and not as the scribes.
The word astonished—ekplessomai in the Greek—means far more than a polite admiration, more than a “Wow!” factor. It is stronger, deeper, sharper. It carries the sense of being shaken, disturbed, even struck with fear. They weren’t just impressed—they were unsettled. His words pierced them, exposed them. It was the shock of standing in the presence of something far greater than themselves.
The congregation’s experience that day at the synagogue was like our discussion last Lord’s Day about Simon Peter’s reaction at the miraculous catch of fish by Jesus’ command. You might recall his fearful response when he realized that—although not yet understanding how or in what way— he was in the presence of God. When Simon saw the authority of Jesus even over the sea, he fearfully responded (Luke 5:8): “Depart from me, for I am a sinful man, O Lord!”
The same holy fear now fell upon the synagogue in Capernaum. When the people there heard Jesus speak with an authority unlike anything they had ever encountered they realized that this brilliant man was superior even to their great rabbis. Something extraordinary was happening that day in Capernaum. Something supernatural. Something far beyond human ability or explanation. Right there, in their very midst, a power and an authority they had never witnessed before was unfolding. They could not explain it, they could not understand it—but they were struck with awe and holy fear.
This moment in Capernaum was not the first glimpse of Jesus’ extraordinary intellect—an intellect far beyond ordinary humanity. Do you remember the account of Jesus as a twelve-year-old boy, when he went with his parents to Jerusalem for the Passover?
After the feast, Mary and Joseph set out on the journey home, likely surrounded by the great caravan of friends, relatives, and fellow travelers. But after three days, they realized with shock and dread that Jesus was not among them. They had lost their son.
They turned around, went back to Jerusalem, and found that twelve-year-old lad sitting with the great teachers, listening to them and asking them questions. Luke writes of the young Jesus, sitting there among some of the world’s greatest scholars (Luke 2:46-48): They found Him in the temple, sitting in the midst of the teachers, both listening to them and asking them questions. 47 And all who heard Him were astonished at His understanding and answers. 48 So when they saw Him, they were amazed.
There is that word again—amazed! This is the same Greek word that Mark used to describe the reaction of the crowd in the synagogue. The wisest men of Israel, when they witnessed the astonishing brilliance of that young lad, realized that this was no ordinary boy. As we might say, “He was so smart it was scary!”
And so the question presses in upon us: How did this man—Jesus of Nazareth—possess such profound knowledge? How could one raised in a small, out-of-the-way village so far surpass the greatest teachers of Israel? How could he, with no formal training under the rabbis, excel beyond them all—indeed, beyond every teacher the world has ever known?
The scribes and rabbis sat at the feet of great men of renown like Gamaliel and Hillel and Shammai. But Jesus spoke with a brilliance and authority that put them all to shame. How did he do it? What was the source of this man’s profound knowledge and indisputable authority? Another question, which we are going to address later, is what does it mean for us?
First, what was the source of the incomparable, unparalleled, and matchless knowledge of that man of Nazareth, who stood in the synagogue and was so brilliant that it literally scared people?
Jesus revealed the source of his greatness by his own words in Holy Scripture. John chapter eight discusses a harsh confrontation between Jesus and the Pharisees. There, Jesus claimed, “I am the light of the world. He who follows me shall not walk in darkness but have the light of life” (John 8:12).
The Pharisees responded by literally calling him a liar. Jesus countered, “I am one who bears witness of myself, and the Father who sent me bears witness of me” (John 8:18). He continued saying, “He who sent me is true, and I speak to the world those things which I heard from him” (John 8:26). Even further, Jesus explained in John 10:30, “I and the Father are one.”
There is the source of Jesus’ infinite knowledge. Every word he spoke to the people of Israel, every word he declared to their leaders, came directly from God. For he and the Father are one. When Jesus spoke, it was God who spoke. And people were disturbed and shaken, for they were standing in the presence of his divine authority.
Not only did Jesus speak with divine authority, but he spoke from the vast, inexhaustible, total knowledge that only God possesses. How could this be? As he said in the passage we just cited: He and the Father are one. Jesus is fully God, as the Father is God. He possesses the same omniscience, the same all-knowing, as the Father.
The Bible explains the complete unity of Jesus and the Father, saying of Jesus in Colossians 2:9: In him dwells all the fullness of the Godhead bodily. The NIV puts it this way: In Christ all the fullness of Deity lives in bodily form. And the New Living Translation says it even more plainly: In Christ lives all the fullness of God in a human body.
When Jesus spoke, the very voice of God emerged from human lips. No wonder they were astonished. They were hearing the infinite wisdom of the Almighty clothed in the words of a man.
This divine person spoke from the ultimate receptacle of knowledge. Jesus Christ in his divine nature knows every fact that has ever been, now is, or ever will be in the entire universe—and even in heaven and hell. He has full, comprehensible, infinite knowledge of all things. In fact, he created all things, so naturally, he knows all about them. John wrote of him: All things were made through him, and without him nothing was made that was made (John 1:3).
The world is amazed and wowed by super smart people. People like Plato and Aristotle, or Thomas Aquinas. The world is super-impressed by men like Albert Einstein or Steven Hawking because of the great knowledge they have of physics and cosmology.
But what are these men, really? Einstein’s claim to fame includes his theory of quantum physics. Hawking made waves with his knowledge of space and the cosmos. But, folks, compared to the knowledge of the Son of God, these men actually knew very little. Such men are thought to know a lot about the physical universe. And, humanly speaking, they certainly did! But how does what their knowledge knows compare to the knowledge of the one who made the universe?
All that the greatest human scholars and scientists are doing is this: they are merely exploring, discovering, and reporting on what Jesus himself already designed, created, and spoke into existence—together with the Father and the Holy Spirit—when the world was made. The truths they labor to uncover are but footnotes to the wisdom of Christ, who is the Author of all creation.
There has never been, and will never be, another man in this world of whom can be said, as in Colossians 2:3: In whom are hidden all the treasures of wisdom and knowledge. The best and most gifted of humans are merely discovering the treasures of wisdom and knowledge that reside in the created world of Jesus Christ.
What Does Christ’s Authority Over the Realm of Knowledge Mean for Us?
What we have discussed this morning explains how Jesus knew all that he knew (and knows). It explains the source of his knowledge and authority. But what does it mean for us as human beings redeemed by Jesus? It is good to know and understand that Jesus is omniscient—meaning that he has full knowledge of every fact past, present, and future. But beyond knowing it, how does it affect us as Christ followers?
First, Jesus’ all-knowing nature means that he knows you completely—and still loves you. Jesus knows everything about you.
He knows all the things about us that we hope no one else ever does. He knows your past, your thoughts, your weaknesses, your fears, your sins—all of it. And he still loves you. There is nothing hidden from him, and yet in him there is no rejection of you if you are one of his beloved redeemed ones. Romans 8:1 assures us: There is therefore now no condemnation to those who are in Christ Jesus.
Also, he knows what you need—even before you ask. In Psalm 139, David spoke thus: Lord, you have searched me and known me. For there is not a word on my tongue, but behold, O Lord, you know it altogether.
Jesus is not caught off guard by your circumstances, no matter what comes your way in life. Jesus’ care for you is never delayed, never misinformed, and never failing.
Even when you can’t put your needs into words, he understands perfectly and—along with the Holy Spirit—intercedes for you before the Father in Heaven. Romans 8:26-27 speaks of the work of both Jesus and the Holy Spirit in your life:
26 Likewise the Spirit also helps in our weaknesses. For we do not know what we should pray for as we ought, but the Spirit Himself makes intercession for us with groanings which cannot be uttered. 27 Now He who searches the hearts knows what the mind of the Spirit is, because He [Jesus] makes intercession for the saints according to the will of God.
Furthermore, Jesus guides perfectly—because he sees everything. Jesus said of himself, “I am the good shepherd… My sheep listen to my voice; I know them, and they follow me” (John 10:14, 27).
When you turn to anyone but Jesus Christ to lead you through life, you might be following a blind guide who will lead both you and himself into the same ditch. But when you follow Jesus, you are being led by a divine person who sees the beginning and the end. Even when life feels uncertain or painful, his guidance is always infinitely wise and cannot fail. You can trust him, even when you don’t understand—because he does.
Also, Jesus’ complete knowledge of all things means that he judges justly—because he knows all motives. John 2:24-25 says of Jesus, as we quote in present tense terms: He knows all men…for he himself knows what is in man.
Jesus sees not just all actions; he sees all hearts. His justice is perfect. He is never deceived, and he never misjudges. That brings a sobering accountability to all people. And it gives you hope when you are wronged by others.
Sometimes we try our best to get along with people, but they hurt us, do us wrong, and treat us as if we were worthless—even when we have done nothing but the best of good to them.
We should never feel that no one sees, no one knows, no one cares about our good motives. And we should never think that people who treat us wickedly will never be brought to justice. They will—whether in this life or later. The just and righteous judge of all mankind will make all things right.
Lastly, Jesus’ complete knowledge means that he is never surprised—so you are never alone in a crisis.
One of the worst things in life is to be in a crisis or terrible predicament and feel like no one knows or cares. But when life feels chaotic, you can rest assured knowing that Jesus is not surprised. He knows! He cares!
You might have never seen it coming, but he certainly did. He is in it with you and will be all the way. In fact, he is already working in it for your good (Romans 8:28): And we know that all things work together for good to those who love God, to those who are called according to his purpose.
So, in summary, the fact that Jesus is omniscient—all-knowing—means to you that you are fully known and still fully loved; you are never forgotten, and your needs are never overlooked; you are led by one who cannot be wrong, and will lead you aright; you are secure in a Savior who knows the end from the beginning; and you are under the watchful eye of God who judges right, will always do what is right, and will always do what is for your best benefit. Amen.
Benediction: 20 Now may the God of peace who brought up our Lord Jesus from the dead, that great Shepherd of the sheep, through the blood of the everlasting covenant, 21 make you complete in every good work to do His will, working in you what is well pleasing in His sight, through Jesus Christ, to whom be glory forever and ever. Amen. (Hebrews 13:20-21)