Cross reference
John 9:25
25 He therefore answered, Whether he is a sinner, I know not: one thing I know, that, whereas I was blind, now I see.
John 5:11
11 But he answered them, He that made me whole, the same said unto me, Take up thy bed, and walk.
John 9:30
30 The man answered and said unto them, Why, herein is the marvel, that ye know not whence he is, and `yet' he opened mine eyes.
1 John 5:10
10 He that believeth on the Son of God hath the witness in him: he that believeth not God hath made him a liar; because he hath not believed in the witness that God hath borne concerning his Son.