Charles Spurgeon Commentary 1 John 2:1-4

"My little children, these things write I unto you that ye may not sin. And if any man sin, we have an Advocate with the Father, Jesus Christ the righteous: and he is the propitiation for our sins; and not for ours only, but also for the whole world. And hereby we 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;" — 1 John 2:1-4 (ASV)

My little children, these things I write to you, that you sin not.

And if any man sin, we have an advocate with the Father, Jesus Christ the righteous: and he is the propitiation for our sins: and not for ours only, but also for the sins of the whole world. And by this we do know that we know him, if we keep his commandments. He that says, I know him, and keeps not his commandments, is a liar, and the truth is not in him.

Holy living is the sure fruit and proof of anyone being in Christ.

Where it is not manifest, the profession of being in Christ is a lie.