He who is virtuous is wise; and he who is wise is good; and he who is good is happy.

The science of numbers ought to be preferred as an acquisition before all others, because of its necessity and because of the great secrets and other mysteries which there are in the properties of numbers. All sciences partake of it, and it has need of none.

A man content to go to heaven alone will never go to heaven.

Contemplate the extent and stability of the heavens, and then at last cease to admire worthless things.

A person is an individual substance of a rational nature.

So nothing is ever good or bad unless you think it so, and vice versa. All luck is good luck to the man who bears it with equanimity.

...Whose souls, albeit in a cloudy memory, yet seek back their good, but, like drunk men, know not the road home.