Verse

1 John 2:8

A church father on this verse
"This is the commandment; for the darkness" of perversion, that is, "has passed away, and, lo, the true light has already shone," - that is, through faith, through knowledge, through the Covenant working in men, through prepared judgments.
Clement of Alexandria, 3th c. — From the Latin Translation of Cassiodorus
Original

8Again, a new commandment I write unto you, which thing is true in him and in you: because the darkness is past, and the true light now shineth.

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In context

6He that saith he abideth in him ought himself also so to walk, even as he walked.

7Brethren, I write no new commandment unto you, but an old commandment which ye had from the beginning. The old commandment is the word which ye have heard from the beginning.

1 John 2:8

9He that saith he is in the light, and hateth his brother, is in darkness even until now.

10He that loveth his brother abideth in the light, and there is none occasion of stumbling in him.

Read all of 1 John 2