If you will do some deed before you die, Remember not this caravan of death, But have belief that every little breath Will stay with you for an eternity.
As quoted in The Diwan of Abu'l-Ala (1909) by Henry Baerlein, XLVII
They recite their sacred books, although the fact informs me that these are a fiction from first to last. O Reason, thou (alone) speakest the truth. Then perish the fools who forged the (religious) traditions or interpreted them!
As quoted in "The Meditations of Al-Maʿarri", Studies in Islamic Poetry (1921) by R. A. Nicholson, Verse 129, p. 110
The inhabitants of the earth are of two sorts: Those with brains, but no religion, And those with religion, but no brains.
The world holds two classes of men; intelligent men without religion, and religious men without intelligence.
A Short History of Freethought Ancient and Modern (1906) by John Mackinnon Robertson, Vol. I, Ch. VIII: Freethought under Islam, p. 269
The world is divided into men who have wit and no religion and men who have religion and no wit.
This form of the statement has been most commonly misattributed — to Avicenna, in A Rationalist Encyclopaedia: A Book of Reference on Religion, Philosophy, Ethics, and Science (1950) by Joseph McCabe, p. 43, and later to Averroes, in The Atheist World (1991) by Madalyn Murray O'Hair, p. 46.