1 John 2:3-6

3 And by this we may be certain that we have knowledge of him, if we keep his laws.

4 The man who says, I have knowledge of him, and does not keep his laws, is false, and there is nothing true in him:

5 But in every man who keeps his word, the love of God is made complete. By this we may be certain that we are in him:

6 He who says that he is living in him, will do as he did.