It is hard to overstate the debt we owe to the men and women of genius.

What light is to the eyes - what air is to the lungs - what love is to the heart, liberty is to the soul of man.

If there be an infinite Being, he does not need our help - we need not waste our energies in his defense.

The way to be happy is to make others so.

If there is a God, there should be no slaves.

To me, the most obscene word in our language is celibacy.

Whenever a man believes that he has the exact truth from God, there is in that man no spirit of compromise. He has not the modesty born of the imperfections of human nature; he has the arrogance of theological certainty and the tyranny born of ignorant assurance. Believing himself to be the slave of God, he imitates his master, and of all tyrants the worst is a slave in power.