Read this passage and open each verse for the full verse feed and commentary tools.
9He that saith he is in the light and hateth his brother, is in the darkness even until now. 10He that loveth his brother abideth in the light, and there is no occasion of stumbling in him. 11But he that hateth his brother is in the darkness, and walketh in the darkness, and knoweth not whither he goeth, because the darkness hath blinded his eyes.
1 John 2:9-11 (ASV)