Suicide is not abominable because God prohibits it; God prohibits it because it is abominable.

Upon the solution of this problem, or upon sufficient proof of the impossibility of synthetical knowledge a priori, depends the existence or downfall of metaphysics.

Sincerity is the indispensable ground of all conscientiousness, and by consequence of all heartfelt religion.

The function of the true state is to impose the minimum restrictions and safeguard the maximum liberties of the people, and it never regards the person as a thing.

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

Freedom is the alone unoriginated birthright of man, and belongs to him by force of his humanity.

But where only a free play of our presentational powers is to be sustained, as in the case of pleasure gardens, room decoration, all sorts of useful utensils, and so on, any regularity that has an air of constraint is [to be] avoided as much as possible. That is why the English taste in gardens, or the baroque taste in furniture, carries the imagination's freedom very far, even to the verge of the grotesque, because it is precisely this divorce from any constraint of a rule that the case is posited where taste can show its greatest perfection in designs made by the imagination.