1 John 2:3-6 NET
Now by this we know that we have come to know God: if we keep his commandments. The one who says “I have come to know God” and yet does not keep his commandments is a liar, and the truth is not in such a person. But whoever obeys his word, truly in this person the love of God has been perfected. By this we know that we are in him. The one who says he resides in God ought himself to walk just as Jesus walked.
NET: New English Translation