Only a jackass ever talks over his affairs with a woman, whether she be his sweetheart, wife, or sister, or mother.

[Thomas Henry] Huxley, I believe, was the greatest Englishman of the Nineteenth Century—perhaps the greatest Englishman of all time. When one thinks of him, one thinks inevitably of such men as Goethe and Aristotle. For in him there was that rich, incomparable blend of intelligence and character, of colossal knowledge and high adventurousness, of instinctive honesty and indomitable courage which appears in mankind only once in a blue moon. There have been far greater scientists, even in England, but there has never been a scientist who was a greater man.

The demagogue is one who preaches doctrines he knows to be untrue to men he knows to be idiots.

The most dangerous man to any government is the man who is able to think things out for himself.

You can't do anything about the length of your life, but you can do something about its width and depth.

I hope I need not confess that a large part of my stock in trade consists of platitudes rescued from the cobwebbed shelves of yesterday... This borrowing and refurbishing of shop-worn goods, as a matter of fact, is the invariable habit of traders in ideas, at all times and everywhere. It is not, however, that all the conceivable human notions have been thought out; it is simply, to be quite honest, that the sort of men who volunteer to think out new ones seldom, if ever, have wind enough for a full day's work.

It was morality that burned the books of the ancient sages, and morality that halted the free inquiry of the Golden Age and substituted for it the credulous imbecility of the Age of Faith. It was a fixed moral code and a fixed theology which robbed the human race of a thousand years by wasting them upon alchemy, heretic-burning , witchcraft and sacerdotalism.