Beautiful objects are wrought by study through effort, but ugly things are reaped automatically without toil.

All things happen by virtue of necessity.

Magnanimity consists in enduring tactlessness with mildness.

I am the most travelled of all my contemporaries; I have extended my field of enquiry wider than anybody else, I have seen more countries and climes, and have heard more speeches of learned men. No one has surpassed me in the composition of lines, according to demonstration, not even the Egyptian knotters of ropes, or geometers.

These differences, they say, are three: shape, arrangement, and position; because they hold that what is differs only in contour, inter-contact, inclination.

Poor mind, from the senses you take your arguments, and then want to defeat them? Your victory is your defeat.

Reason is often a more powerful persuader than gold.