1 John 2:2-6 Revised Standard Version (RSV)
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. 4 He who says “I know him” but disobeys his commandments is a liar, and the truth is not in him; 5 but whoever keeps his word, in him truly love for God is perfected. By this we may be sure that we are in him: 6 he who says he abides in him ought to walk in the same way in which he walked.