Avicenna says in one of his books in definition of mystic as: the one that doesn't allow himself physical pleasures and overlooks this carnal world's pleasures is called "ascetic". The one that observes saying prayers and fasting, etc. is called "worshiper". The one that prevents his conscious from paying attention to the others but God and directed it to the transcendent world to be enlightened by God's light is known as "mystic".