Two things fill the mind with ever new and increasing admiration and awe, the more often and steadily we reflect upon them: the starry heavens above me and the moral law within me. I do not seek or conjecture either of them as if they were veiled obscurities or extravagances beyond the horizon of my vision; I see them before me and connect them immediately with the consciousness of my existence.

All human knowledge begins with intuitions, proceeds from thence to concepts, and ends with ideas.

In all judgements by which we describe anything as beautiful, we allow no one to be of another opinion.

Two things strike me dumb: the infinite starry heavens, and the sense of right and wrong in man.

Always treat people as ends in themselves, never as means to an end.

Why were a few, or a single one, made at all, if only to exist in order to be made eternally miserable, which is infinitely worse than non-existence?

Immaturity is the incapacity to use one's intelligence without the guidance of another.