Successful minds work like a gimlet--to a single point.
Books are embalmed minds.
The most brilliant flashes of wit come from a clouded mind, as lightning leaps only from an obscure firmament.
Few minds wear out; more rust out.
Difficulties, by bracing the mind to overcome them, assist cheerfulness, as exercise assists digestion.
At the best, sarcasms, bitter irony, scathing wit, are a sort of swordplay of the mind. You pink your adversary, and he is forthwith dead; and then you deserve to be hung for it.