Where there is no religion, hypocrisy becomes good taste.

It is not enough to know what is good: you must be able to do it.

No question is so difficult to answer as that to which the answer is obvious.

Beware of false knowledge; it is more dangerous than ignorance.

You are all alike, you respectable people. You can't tell me the bursting strain of a ten-inch gun, which is a very simple matter;but you all think you can tell me the bursting strain of a man under temptation. You daren't handle high explosives; but you're all ready to handle honesty and truth and justice and the whole duty of man, and kill one another at that game. What a country! What a world!

Science becomes dangerous only when it imagines that it has reached its goal.

Though I can make my extravaganzas appear credible, I cannot make the truth appear so.