In the formation of species Nature gets, as it were, into a cul-de-sac; she cannot make her way through, and is disinclined to turn back. Hence the stubbornness of national character.
Every one has something in his nature which, if he were to express it openly, would of necessity give offence.
If a man thinks about his physical or moral condition, he generally finds that he is ill.
Nature asks that a man should sometimes be stupefied without going to sleep; hence the pleasure in the smoking of tobacco, the drinking of brandy, the use of opiates.
The man who is up and doing should see to it that what he does is right. Whether or not right is done, is a matter which should not trouble him.