Act so that the maxim of your act could be made the principle of a universal law.

There is nothing higher than reason.

THERE ARE TWO THINGS that don't have to mean anything, one is music and the other is laughter.

Two things awe me most, the starry sky above me and the moral law within me.

Law And Freedom without Violence (Anarchy) Law And Violence without Freedom (Despotism) Violence without Freedom And Law (Barbarism) Violence with Freedom And Law (Republic)

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

Life is the faculty of spontaneous activity, the awareness that we have powers.