Passage
I didn’t know him, but for this reason I came baptizing in water: that he would be revealed to Israel.”
John 1:31 (WEB)
Nearby Context
John 1:29 The next day, he saw Jesus coming to him, and said, “Behold, the Lamb of God, who takes away the sin of the world!
John 1:30 This is he of whom I said, ‘After me comes a man who is preferred before me, for he was before me.’
John 1:31 I didn’t know him, but for this reason I came baptizing in water: that he would be revealed to Israel.”
John 1:32 John testified, saying, “I have seen the Spirit descending like a dove out of heaven, and it remained on him.
John 1:33 I didn’t recognize him, but he who sent me to baptize in water, he said to me, ‘On whomever you will see the Spirit descending, and remaining on him, the same is he who baptizes in the Holy Spirit.’
Study Lenses
The verse centers on "didn", "reason", "came", "baptizing", "water", "revealed", and "israel". It is saying that the verse draws attention to "didn" and "reason", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 30's "This is he of whom I said..." into verse 32's "John testified saying I have seen the...", so "didn" and "reason" belong inside that flow. In John context, the local focus is the identity of Jesus, new birth, eternal life, and belief and unbelief.
A plain takeaway is to answer the verse's own emphasis on "didn" and "reason" with trust shaped by these words, not by a vague optimism outside the passage.