It is almost as difficult to make a man unlearn his errors as his knowledge.

Brutes leave ingratitude to man.

Bed is a bundle of paradoxes: we go to it with reluctance, yet we quit it with regret.

Sturdy beggars can bear stout denials.

Men of strong minds and who think for themselves, should not be discouraged on finding occasionally that some of their best ideas have been anticipated by former writers; they will neither anathematize others nor despair themselves. They will rather go on discovering things before discovered, until they are rewarded with a land hitherto unknown, an empire indisputably their own, both right of conquest and of discovery.

Cheerfulness ought to be the viaticum vitae of their life to the old; age without cheerfulness is a Lapland winter without a sun.

Sleep, the type of death, is also, like that which it typifies, restricted to the earth. It flies from hell and is excluded from heaven.