Of the many beautiful and true ideas which the utterance ‘God is light’ suggests to us, three are specially prominent in this Epistle; intelligence, holiness, and communicativeness. The Christian, anointed with the Holy Spirit, and in communion with God in Christ, possesses [1] knowledge, [2] righteousness, and [3] necessarily communicates to others the truth which he knows and the righteousness which he practises.

https://www.studylight.org/commentaries/cgt/1-john-1.html