(25) He answered and said, “Whether He is a sinner or not I do not know. One thing I know: that though I was blind, now I see.” (26) Then they said to him again, “What did He do to you? How did He open your eyes?” (27) He answered them, “I told you already, and you did not listen. Why do you want to hear it again? Do you also want to become His disciples?” (28) Then they reviled him and said, “You are His disciple, but we are Moses’ disciples. (29) We know that God spoke to Moses; as for this fellow, we do not know where He is from.”
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The healed man readily acknowledges his ignorance but then adds, “One thing I know: that though I was blind, now I see” (John 9:25). Despite not knowing of Jesus, he is certain that He had changed him. In this, he becomes a type of genuine Christians. They do not know everything, but what they know they truly know because they have met and accepted Jesus personally as Lord and Savior.
Unlike the others, the man humbly begins with his limitations in knowledge. Both the parents and Pharisees say “we know” first and only after they declare what they do not know (see verses 20-21, 24-29), revealing their cowardice or ignorance. The man first admits his ignorance but then affirms what he knows as the result of God's revelation.
In his humble state, he easily recognizes the lack of knowledge in others, in this case, the greater ignorance of the “educated” leaders of the people. Having eliminated false self-confidence as well as any unjustified confidence in the Pharisees, all that remains is what he truly knows: He could now see. Thus, he takes his stand on the certainties.
As Christians, beginning in ignorance and sin, we confess both our spiritual dependence and our failings. We realize that, unless God chooses to reveal Himself—which He does in His Word and in Christ—we can know nothing. No one can know God by means of human reasoning or by any other human instrument (Job 11:7; I Corinthians 2:14). Spiritual knowledge is not revealed even through religious tradition, but it comes through the intervention of God in history, in His written Word, and the opening of the mind by the Holy Spirit—and only to those whom God calls.
Jesus says to the once-blind man, “Do you believe in the Son of God?” Having been blind, do we now entrust our spiritual well-being to Jesus Christ?
— Martin G. Collins