1John 2:3-6
3 And by this we know that we have come to know him, if we keep his commandments.4 Whoever says “I know him” but does not keep his commandments is a liar, and the truth is not in him, 5 but whoever keeps his word, in him truly the love of God is perfected. By this we may know that we are in him:6 whoever says he abides in him ought to walk in the same way in which he walked.