There is no greater reason for children to honour parents than for parents to honour children except, that while the children are young, the parents are stronger than children.

Collective fear stimulates herd instinct, and tends to produce ferocity toward those who are not regarded as members of the herd.

The immense majority of intellectually eminent men disbelieve in the Christian religion, but they conceal the fact in public, because they are afraid of losing their incomes.

Not to be absolutely certain is, I think, one of the essential things in rationality.

John Locke invented common sense, and only Englishmen have had it ever since!

Science seems to be at war with itself.... Naive realism leads to physics, and physics, if true, shows naive realism to be false. Therefore naive realism, if true, is false; therefore it is false.

Mathematics, rightly viewed, possesses not only truth, but supreme beauty-a beauty cold and austere ... yet sublimely pure and capable of stern perfection such as only the greatest art can show.