Whenever anything is spoken against you that is not true, do not pass by or despise it because it is false; but forthwith examine yourself, and consider what you have said or done that may administer a just occasion of reproof.

If you hate your enemies, you will contract such a vicious habit of mind that it will break out upon those who are your friends, or those who are indifferent to you.

This excerpt is presented as reproduced by Copernicus in the preface to De Revolutionibus: "Some think that the earth remains at rest. But Philolaus the Pythagorean believes that, like the sun and moon, it revolves around the fire in an oblique circle. Heraclides of Pontus and Ecphantus the Pythagorean make the earth move, not in a progressive motion, but like a wheel in rotation from west to east around its own center."

Either is both, and Both is neither.

Courage and wisdom are, indeed, rarities amongst men, but of all that is good, a just man it would seem is the most scarce.

Perseverance is more prevailing than violence; and many things which cannot be overcome when they are together, yield themselves up when taken little by little.

The present offers itself to our touch for only an instant of time and then eludes the senses.