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

The true aim of medicine is not to make men virtuous; it is to safeguard and rescue them from the consequences of their vices. The physician does not preach repentance; he offers absolution.

A metaphysician is one who, when you remark that twice two makes four, demands to know what you mean by twice, what by two, what by makes, and what by four. For asking such questions metaphysicians are supported in oriental luxury in the universities, and respected as educated and intelligent men.

When a candidate for public office faces the voters he does not face men of sense; he faces a mob of men whose chief distinguishing mark is the fact that they are quite incapable of weighing ideas, or even of comprehending any save the most elemental - men whose whole thinking is done in terms of emotion, and whose dominant emotion is dread of what they cannot understand. So confronted, the candidate must either bark with the pack or be lost... All the odds are on the man who is, intrinsically, the most devious and mediocre.

The Americans are the illegitimate children of the English.

I believe in only one thing and that thing is human liberty.

It takes no more actual sagacity to carry on the everyday hawking and haggling of the world, or to ladle out its normal doses of bad medicine and worse law, than it takes to operate a taxicab or fry a pan of fish.