It is therefore correct to say that the senses do not err — not because they always judge rightly, but because they do not judge at all.

Enlightenment is man's emergence from his self-incurred immaturity.

If we knew that god exists, such knowledge would make morality impossible. For, if we acted morally from fear or fright, or confident of a reward, then this would not be moral. It would be enlightened selfishness.

I assert that, in any particular natural science, one encounters genuine scientific substance only to the extent that mathematics is present.

Freedom in the practical sense is the independence of the power of choice from necessitation by impulses of sensibility

We come no nearer the infinitude of the creative power of God, if we enclose the space of its revelation within a sphere described with the radius of the Milky Way, than if we were to limit it to a ball an inch in diameter. All that is finite, whatever has limits and a definite relation to unity, is equally far removed from the infinite... Eternity is not sufficient to embrace the manifestations of the Supreme Being, if it is not combined with the infinitude of space.

Humanity is at its greatest perfection in the race of the whites.