There will always be some people who think for themselves, even among the self-appointed guardians of the great mass who, after having thrown off the yoke of immaturity themselves, will spread about them the spirit of a reasonable estimate of their own value and of the need for every man to think for himself.

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.

Time is not an empirical concept. For neither co-existence nor succession would be perceived by us, if the representation of time did not exist as a foundation a priori.

Always recognize that human individuals are ends, and do not use them as means to your end.

Dare to know! Have the courage to use your own intelligence!

An action is essentially good if the motive of the agent be good, regardless of the consequences.

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