To have doubted one's own first principles is the mark of a civilized man.

Between two groups of people who want to make inconsistent kinds of worlds, I see no remedy but force.

What I wouldn't give to be seventy again!

Knowledge-it excites prejudices to call it science-is advancing as irresistibly, as majestically, as remorselessly as the ocean moves in upon the shore.

The greatest act of faith is when a man understands he is not God.

On the whole, I am on the side of the unregenerate who affirms the worth of life as an end in itself, as against the saints who deny it.

[The Constitution] is an experiment as all life is an experiment.