As long as justice and injustice have not terminated their ever renewing fight for ascendancy in the affairs of mankind, human beings must be willing, when need is, to do battle for the one against the other.

It must be granted that in every syllogism, considered as an argument to prove the conclusion, there is a petitio principii. When we say, All men are mortal Socrates is a man therefore Socrates is mortal; it is unanswerably urged by the adversaries of the syllogistic theory, that the proposition, Socrates is mortal.

The ne plus ultra of wickedness ... is embodied in what is commonly presented to mankind as the creed of Christianity.

Next to selfishness the principal cause which makes life unsatisfactory is want of mental cultivation.

When one's ideas are not challenged, one's ability to defend them weakens.

There are many truths of which the full meaning cannot be realized until personal experience has brought it home.

The worth of the state, in the long run, is the worth of the individuals composing it.