Be careful never to retire to rest in a room not properly ventilated.

Knowledge is but an instrument, which the profligate and the flagitious may use as well as the brave and the just.

Avoid witticisms at the expense of others.

In vain do they talk of happiness who never subdued an impulse in obedience to a principle. He who never sacrificed a present to a future good, or a personal to a general one, can speak of happiness only as the blind speak of color.

Man is improvable. Some people think he is only a machine, and that the only difference between a man and a mill is, that one is carried by blood and the other by water.

Education alone can conduct us to that enjoyment which is, at once, best in quality and infinite in quantity.

Injustice alone can shake down the pillars of the skies, and restore the reign of Chaos and Night.