It is from this absolute indifference and tranquillity of the mind, that mathematical speculations derive some of the most considerable advantages; because there is nothing to interest the imagination; because the judgment sits free and unbiased to examine the point. All proportions, every arrangement of quantity, is alike to the understanding, because the same truths result to it from all; from greater from lesser, from equality and inequality.

My good friends, while I do most earnestly recommend you to take care of your health and safety, as things most precious to us, I would not have that care degenerate into an effeminate and over-curious attention, which is always disgraceful to a man's self, and often troublesome to others.

As the rose-tree is composed of the sweetest flowers and the sharpest thorns, as the heavens are sometimes overcast—alternately tempestuous and serene—so is the life of man intermingled with hopes and fears, with joys and sorrows, with pleasure and pain.

Example is the school of mankind, and they will learn at no other.

Teach me, O lark! with thee to greatly rise, to exalt my soul and lift it to the skies.

The only training for the heroic is the mundane.

By this unprincipled facility of changing the state as often, and as much, and in as many ways as there are floating fancies or fashions, the whole chain and continuity of the commonwealth would be broken. No one generation could link with the other. Men would become little better than the flies of a summer.