Little else is requisite to carry a state to the highest degree of opulence from the lowest barbarism but peace， easy taxes， and a tolerable administration of justice.
The first condition of understanding a foreign country is to smell it.
遗忘比绝望更强有力。
The writer must be a stranger in his own country.
Psychology must be a guide to practical living.
The laws of physics are the same everywhere in the universe, and that is a profound truth.