“Treat people as an end, and never as a means to an end.”

Man must be disciplined, for he is by nature raw and wild.

Experience without theory is blind, but theory without experience is mere intellectual play.

What might be said of things in themselves, separated from all relationship to our senses, remains for us absolutely unknown.

We are enriched not by what we possess, but by what we can do without.

For peace to reign on Earth, humans must evolve into new beings who have learned to see the whole first.

Freedom is the opposite of necessity.

Without man and his potential for moral progress, the whole of reality would be a mere wilderness, a thing in vain, and have no final purpose.

Give me matter and I will build a world out of it.

The possession of power inevitably spoils the free use of reason.

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

Heaven has given human beings three things to balance the odds of life: hope, sleep, and laughter.

Thoughts without content are empty, intuitions without concepts are blind.

The cultivation of reason leads humanity sooner to misery than happiness.

Have patience awhile; slanders are not long-lived. Truth is the child of time; erelong she shall appear to vindicate thee.

Innocence is a splendid thing, only it has the misfortune not to keep very well and to be easily misled.

One who makes himself a worm cannot complain afterwards if people step on him.