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

I express the principle of one's freedom as a human being in this formula: No one can compel me (in accordance with his beliefs about the welfare of others) to be happy after his fashion.

Only the descent into the hell of self-knowledge can pave the way to godliness.

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...