But he who hates his brother is in the darkness, and walks in the darkness, and doesn't know where he is going, because the darkness has blinded his eyes.

 (ii) In 1 John 2:29 John comes back to a thought which is never far from his mind. The only way in which a man can prove that he is abiding in Christ is by the righteousness of his life. The profession a man makes will always be proved or disproved by his practice. 