The mind of the greatest man on earth is not so independent of circumstances as not to feel inconvenienced by the merest buzzing noise about him; it does not need the report of a cannon to disturb his thoughts. The creaking of a vane or a pully is quite enough. Do not wonder that he reasons ill just now; a fly is buzzing by his ear; it is quite enough to unfit him for giving good counsel.

By space the universe encompasses and swallows me up like an atom; by thought I comprehend the world.

If they [Plato and Aristotle] wrote about politics it was as if to lay down rules for a madhouse. And if they pretended to treat it as something really important it was because they knew that the madmen they were talking to believed themselves to be kings and emperors. They humored these beliefs in order to calm down their madness with as little harm as possible.

Let each of us examine his thoughts; he will find them wholly concerned with the past or the future. We almost never think of the present, and if we do think of it, it is only to see what light is throws on our plans for the future. The present is never our end. The past and the present are our means, the future alone our end. Thus we never actually live, but hope to live, and since we are always planning how to be happy, it is inevitable that we should never be so.

We never do evil so effectually as when we are led to do it by a false principle of conscience.

Do they think that they have given us great pleasure by telling us that they hold our soul to be no more than wind or smoke, and saying it moreover in tones of pride and satisfaction? Is this then something to be said gaily? Is it not on the contrary something to be said sadly, as being the saddest thing in the world?

No one is discontented at not being a king except a discrowned king ... unhappiness almost invariably indicates the existence of a road not taken, a talent undeveloped, a self not recognized.