The final test of truth is ridicule. Very few dogmas have ever faced it and survived.

The worst of marriage is that it makes a woman believe that all men are just as easy to fool.

The average man's love of liberty is nine-tenths imaginary, exactly like his love of sense, justice and truth... It takes a special sort of man to understand and enjoy liberty - and he is usually an outlaw in democratic societies.

The notion that science does not concern itself with first causes - that it leaves the field to theology or metaphysics, and confines itself to mere effects - this notion has no support in the plain facts. If it could, science would explain the origin of life on earth at once - and there is every reason to believe that it will do so on some not too remote tomorrow. To argue that gaps in knowledge which will confront the seeker must be filled, not by patient inquiry, but by intuition or revelation, is simply to give ignorance a gratuitous and preposterous dignity.

We suffer most when the White House busts with ideas.

Justice is what you get when you run out of money.

Not by accident, you may be sure, do the Christian Scriptures make the father of knowledge a serpent - slimy, sneaking and abominable.