1John 2:3-6

And hereby we do know that we know him, if we keep his commandments.

He that saith, I know him, and keepeth not his commandments, is a liar, and the truth is not in him.

But whoso keepeth his word, in him verily is the love of God perfected: hereby know we that we are in him.

He that saith he abideth in him ought himself also so to walk, even as he walked.