Passage
and he looked at Jesus as he walked, and said, “Behold, the Lamb of God!”
John 1:36 (WEB)
Nearby Context
John 1:34 I have seen, and have testified that this is the Son of God.”
John 1:35 Again, the next day, John was standing with two of his disciples,
John 1:36 and he looked at Jesus as he walked, and said, “Behold, the Lamb of God!”
John 1:37 The two disciples heard him speak, and they followed Jesus.
John 1:38 Jesus turned, and saw them following, and said to them, “What are you looking for?” They said to him, “Rabbi” (which is to say, being interpreted, Teacher), “where are you staying?”
Study Lenses
The verse centers on "looked", "jesus", "walked", "said", "behold", and "lamb". It is saying that the verse draws attention to "looked" and "jesus", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 35's "Again the next day John was standing..." into verse 37's "The two disciples heard him speak and...", so "looked" and "jesus" 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 "looked" and "jesus" with trust shaped by these words, not by a vague optimism outside the passage.