All the good maxims which are in the world fail when applied to one's self.

The property of power is to protect.

Force rules the world-not opinion; but it is opinion that makes use of force.

Opinion is, as it were, the queen of the world, but force is its tyrant.

All the trouble in the world is due to the fact that man cannot sit still in a room.

If man made himself the first object of study, he would see how incapable he is of going further. How can a part know the whole?

Knowledge has two extremes. The first is the pure natural ignorance in which all men find themselves at birth. The other extreme is that reached by great minds, who, having run through all that men can know, find they know nothing, and come back again to that same natural ignorance from which they set out; this is a learned ignorance which is conscious of itself.