1 John 2:2-4

New Revised Standard Version Catholic Edition

² and he is the atoning sacrifice for our sins, and not for ours only but also for the sins of the whole world.

³ Now by this we may be sure that we know him, if we obey his commandments. ⁴ Whoever says, “I have come to know him,” but does not obey his commandments, is a liar, and in such a person the truth does not exist;