Sheikh Ahmed Ismail Hassan Yassin was a Palestinian imam and politician. He was a founder of Hamas, an Islamist Palestinian paramilitary organization and political party. Yassin also served as the spiritual leader of the organization. source
No man ever got very high by pulling other people down. The intelligent merchant does not knock his competitors. The sensible worker does not work those who work with him. Don't knock your friends. Don't knock your enemies. Don't knock yourself.