And Archimedes, as he was washing, thought of a manner of computing the proportion of gold in King Hiero's crown by seeing the water flowing over the bathing-stool. He leaped up as one possessed or inspired, crying, "I have found it! Eureka!".

Nothing can produce so great a serenity of life as a mind free from guilt and kept untainted, not only from actions, but purposes that are wicked. By this means the soul will be not only unpolluted but also undisturbed. The fountain will run clear and unsullied.

Knavery is the best defense against a knave.

Poverty is dishonorable, not in itself, but when it is a proof of laziness, intemperance, luxury, and carelessness; whereas in a person that is temperate, industrious, just and valiant, and who uses all his virtues for the public good, it shows a great and lofty mind.

For the mind does not require filling like a bottle, but rather, like wood, it only requires kindling to create in it an impulse to think independently and an ardent desire for the truth.

Good fortune will elevate even petty minds, and give them the appearance of a certain greatness and stateliness, as from their high place they look down upon the world; but the truly noble and resolved spirit raises itself, and becomes more conspicuous in times of disaster and ill fortune.

Cato requested old men not to add the disgrace of wickedness to old age, which was accompanied with many other evils.