“In general, the form and the structure of the brains of quadrupeds are almost the same as those of the brain of man…”

As quoted in The Crusades Through Arab Eyes (1984) by Amin Maalouf, p. 37
Variant translations:
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 misatributted — 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.
Original: اِثْنَانِ أَهْلُ الْأَرْضِ ذُو عَقْلٍ بِلَا دِينٍ وَآخَرُ دَيِّنٌ لَا عَقْلَ لَهُ

In Search of Memory (2006)

Source: A New Earth: Awakening to Your Life's Purpose

Source: 1860s, Evidence as to Man's Place in Nature (1863), Ch.2, p. 115

Some Reasons Why (1881)
Context: Suppose then, that I do read this Bible honestly, fairly, and when I get through I am compelled to say, “The book is not true.” If this is the honest result, then you are compelled to say, either that God has made no revelation to me, or that the revelation that it is not true, is the revelation made to me, and by which I am bound. If the book and my brain are both the work of the same Infinite God, whose fault is it that the book and the brain do not agree? Either God should have written a book to fit my brain, or should have made my brain to fit his book.

Source: Big Bang: The Origin of the Universe

talking about the use of neural implants in Kevin Warwick "Human Enhancement - The Way Ahead", ACM Ubiquity, October 2014.
Source: http://ubiquity.acm.org/article.cfm?id=2667642

Methuselah's Children (1958)