John 1:31 Meaning: Why John Didn't Know Jesus

The Greek word behind “knew” is eidō, it means to perceive with the eyes, to be personally acquainted. John is not saying he had never heard of Jesus. He is saying they had no personal relationship. They lived far apart, one in Nazareth, the other in the Judean wilderness. He had never seen Jesus face to face. The word for “revealed” is phaneroō, to make visible something that was hidden. John’s baptising was not just about repentance. It was the spotlight God used to bring Jesus out of obscurity and into public view. And the phrase “I myself” (kagō) is emphatic. John is stressing: this is not second-hand information. God showed me directly. He did not grow up playing with his cousin. He learned who Jesus was by the Spirit’s sign.

Many commentators across traditions agree: John and Jesus were not personally acquainted before the baptism. Wesley notes that Jesus lived in Nazareth and John in the desert, ninety miles apart, a distance that prevented any familiarity. Calvin says John speaks this way to show his testimony came from divine inspiration, not human friendship. Gill points out that although they were related, God arranged that they would not know each other, so no one could accuse them of collusion. Across these readings, one conviction holds: John’s witness was trustworthy because it came from God alone.

Some readers think John contradicts himself because earlier, as an unborn baby, he leaped at Mary’s greeting. So surely he knew Jesus later as a relative? In fact, the word “knew” here means personal acquaintance, not spiritual recognition. John likely had heard of Jesus, but he had never met him as an adult. The sign of the Spirit descending was his first certain knowledge that this man was the Messiah. Luke’s account shows a moment of rejoicing, not a lifelong familiarity.

John teaches us that we don’t need to see the whole picture before we obey. He knew his task, baptise and prepare hearts, but he didn’t know which face in the crowd was the Chosen One. He kept serving, trusting that God would show him. You may be asked to do something faithful, a kindness, a patient word, a step of obedience, without knowing the full outcome. That is enough. God will reveal what you need, when you need it.