“Although it may be extremely reasonable (especially from our present vantage point) to conclude that some part of human evolution, if not aspects of the diversification of hominoids in general, is indeed preserved in the fossil record of Africa, this does not in and of itself lead inexorably to the conclusion that humans and African apes are closely related.”

Der Beruf folgt so wenig aus der Wissenschaft, dass sie ihn sogar ausschließen kann. Denn die Wissenschaft duldet ihrem Wesen nach keine Lösung von sich.
The Life of Students (1915)

Orang-utan Biology (1988)

Source: The Greatest Show on Earth: The Evidence for Evolution (2009), p. 164

"Nonmoral Nature", pp. 42–43
Hen's Teeth and Horse's Toes (1983)

Looking for an Honest Man (2009)
Context: Grappling with real-life concerns — from cloning to courtship, from living authentically to dying with dignity — has made me a better reader. Reciprocally, reading in a wisdom-seeking spirit has helped me greatly in my worldly grapplings. Not being held to the usual dues expected of a licensed humanist — professing specialized knowledge or publishing learned papers — I have been able to wander freely and most profitably in all the humanistic fields. I have come to believe that looking honestly for the human being, following the path wherever it leads, may itself be an integral part of finding it. A real question, graced by a long life to pursue it among the great books, has been an unadulterated blessing.

p, 125
Sudden Origins: Fossils, Genes, and the Emergence of Species (1999)

God doesn't believe in atheists (2002)

"Idealism in International Politics", Rectoral Address at Glasgow University (7 November, 1923).
Quoted in The Times, 8 November 1923, according to "Guarantee of Peace: The League of Nations in British Policy 1914-1925" by Peter J. Yearwood, pg 280
Context: Politically, economically and philosophically the motive of self-interest not only is but must... and ought to be the mainspring of human conduct... For as long a time as the records of history have been preserved human societies passed through a ceaseless process of evolution and adjustment. This process has sometimes been pacific, but more often it has resulted from warlike disturbance. The strength of different nations, measured in terms of arms, varies from century to century. The world continues to offer glittering prizes to those who have stout hearts and sharp swords; it is therefore extremely improbable that the experience of future ages will differ in any material respect from that which has happened since the twilight of the human race … it is for us who, in our history have proved ourselves a martial … people … to maintain in our own hands the adequate means for our own protection and … to march with heads erect and bright eyes along the road of our imperial destiny.

A Manifesto for a Skeptical Africa (2012)