³ And hereby we do know that we know him, if we keep his commandments.

⁴ He that saith, I know him, and keepeth not his commandments, is a liar, and the truth is not in him.

⁵ But whoso keepeth his word, in him verily is the love of God perfected: hereby know we that we are in him.

⁹ But as touching brotherly love ye need not that I write unto you: for ye yourselves are taught of God to love one another.