1 John 2:2-4

Revised Standard Version Catholic Edition

² and he is the expiation for our sins, and not for ours only but also for the sins of the whole world. ³ And by this we may be sure that we know him, if we keep his commandments.^{[a] 4} He who says “I know him” but disobeys his commandments is a liar, and the truth is not in him;