It is certainly a bad sign of common sense to appeal to it as a witness. - Immanuel Kant

The reading of all good books is like a conversation with the finest minds of past centuries.

The touchstone of everything that can be concluded as a law for a people lies in the question whether the people could have imposed such a law on itself.

Inexperienced in the course of world affairs and incapable of being prepared for all the chances that happen in it, I ask myself only 'Can you also will that your maxim should become a universal law?' Where you cannot it is to be rejected...