In the old days, people used to risk their lives in India or in the Americas in order to bring back products which now seem to us to have been of comically little worth, such as brazilwood and pepper, which added a new range of sense experience to a civilization which had never suspected its own insipidity... From these same lands our modern Marco Polos now bring back the moral spices of which our society feels an increasing need as it is conscious of sinking further into boredom, but that this time they take the form of photographs, books, and travelers tales.

The only phenomenon with which writing has always been concomitant is the creation of cities and empires, that is the integration of large numbers of individuals into a political system, and their grading into castes or classes. It seems to have favored the exploitation of human beings rather than their enlightenment.

The world began without man, and it will complete itself without him.

Our students wanted to know everything: but only the newest theory seemed to them worth bothering with. Knowing nothing of the intellectual achievements of the past, they kept fresh and intact their enthusiasm for 'the latest thing'. Fashion dominated their interest: they valued ideas not for themselves but for the prestige that they could wring from them.

I can't help thinking that science would be more appealing if it had no practical use.

Animals are good to think with.

Scientific knowledge advances haltingly and is stimulated by contention and doubt.