Hatred
Never allow hatred for anyone to develop in your heart. You may dislike a man's work, and this you have a right to correct. But you must never hate the person himself. A man and his work are two different things. If the hatred persists, please throw it out of your heart. Otherwise it will interfere with your progress.
Taken from the book "The Spider's Web, Vol. 2", Chapter "Organisation", pg. 303, by Revered Chariji