If all the historic books of the Bible were blotted from the memory of mankind, nothing of value would be lost.

The hope of science is the perfection of the human race. The hope of theology is the salvation of a few, and the damnation of almost everybody.

Not only are we here to protect the public from vicious criminals in the street but also to protect the public from harmful ideas.

It cannot be said too often that actions are good or bad in the light of consequences, and that a clear perception of consequences would control actions. That which increases the sum of human happiness is moral; and that which diminishes the sum of human happiness is immoral. . . . Blind, unreasoning obedience is the enemy of morality.

Is not the history of real civilization the slow and gradual emancipation of the intellect, of the judgment, from the mastery of passion? Is not that man civilized whose reason sits the crowned monarch of his brain - whose passions are his servants?

The way to be happy is to make others so.

But honest men do not pretend to know; they are candid and sincere; they love the truth; they admit their ignorance, and they say, We do not know.