There is the same difference between talent and genius that there is between a stone mason and a sculptor

Mental slavery is mental death, and every man who has given up his intellectual freedom is the living coffin of his dead soul.

Intellect, without heart, is infinitely cruel. . . .

The glory of science is, that it is freeing the soul, breaking the mental manacles, getting the brain out of bondage, giving courage to thought, filling the world with mercy, justice, and joy.

It seems to me impossible for a civilized man to love or worship, or respect the God of the Old Testament. A really civilized man, a really civilized woman, must hold such a God in abhorrence and contempt.

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

Temptations are as thick as the leaves of the forest, and no one can be out of the reach of temptation unless he is dead. The great thing is to make people intelligent enough and strong enough, not to keep away from temptation, but to resist it.