en_tn/1jn/02/08.md

Yet I am writing a new commandment to you

"But in one way the commandment I write to you is a new commandment"

which is true in Christ and in you

"which is true, as shown in Christ's deeds and your deeds"

the darkness is passing away, and the true light is already shining

Here "darkness" is a metaphor for "evil," and "light" is a metaphor for "good." Alternate translation: "you are ceasing to do evil and you are doing more and more good" (See: rc://en/ta/man/translate/figs-metaphor)