Whereas I was blind, now I see - He pays no attention to their cavils, nor to their perversion of justice; but, in the simplicity of his heart, speaks to the fact, of the reality of which he was ready to give them the most substantial evidence.

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John 9:30 The man answered and said to them, Why herein is a marvelous thing, that you know not from where he is, and yet he has opened my eyes.

John 5:11 He answered them, He that made me whole, the same said to me, Take up your bed, and walk.

1 John 5:10 He that believes on the Son of God has the witness in himself: he that believes not God has made him a liar...

One Metaphor and Two Meanings
'I must work the works of Him that sent Me, while it is day: the night cometh when no man can work.'--JOHN ix. 4. 'The night is far spent, the day is at hand: let us therefore cast off the works of darkness, and let us put on the armour of light.'--ROMANS xiii. 12. The contrast between these two sayings will strike you at once. Using the same metaphors, they apply them in exactly opposite directions. In the one, life is the day, and the state beyond death the night; in the other, life is the night, …
Alexander Maclaren—Expositions of Holy Scripture

The Healing of the Man Born Blind.
After the scene in the Temple described in the last chapter, and Christ's consequent withdrawal from His enemies, we can scarcely suppose any other great event to have taken place on that day within or near the precincts of the Sanctuary. And yet, from the close connection of the narratives, we are led to infer that no long interval of time can have elapsed before the healing of the man born blind. [4116] Probably it happened the day after the events just recorded. We know that it was a Sabbath, …
Alfred Edersheim—The Life and Times of Jesus the Messiah

The Doctrine of Christ.
2 John 9-11. "WHOSOEVER transgresseth and abideth not in the doctrine of Christ, hath not God. He that abideth in the doctrine of Christ, he hath both the Father and the Son. If there come any unto you, and bring not this doctrine, receive him not into your house, neither bid him God speed. For he that biddeth him God speed is partaker of his evil deeds" (2 John 9-11). What then is the doctrine of Christ? It is the revealed truth concerning the person of our Lord Jesus Christ, that He is the Son …
Arno Gaebelein—The Lord of Glory