For every one that does evil hates the light, neither comes to the light, lest his deeds should be reproved.…
The margin will show that our translators felt a difficulty about this word "reproved." See Matthew 18:15, where it is rendered "tell him his fault," idea is exactly illustrated by the action of light, which makes manifest the wrong, and leads the conscience to see it and repent of it. It is through this chastening that the man passes from darkness to light. It is because men shrink from this chastening that they hate the light (comp. the remarkable parallel in Ephesians 5:11 et seq.).
(H. W. Watkins, D. D.)
Parallel VersesKJV: For every one that doeth evil hateth the light, neither cometh to the light, lest his deeds should be reproved.