If we say that we haven't sinned, we make him a liar, and his word is not in us.

 (iii) The man who says that he loves God and at the same time hates his brother is a liar ( 1 John 4:20). Love of God and hatred of man cannot exist in the same person. If there is bitterness in a man's heart towards any other, that is proof that he does not really love God. All our protestations of love to God are useless if there is hatred in our hearts towards any man. 