Aristotle

Time is a number of motion in respect of before and after.

Virtue is concerned with passions and actions.

A whole is that which has beginning, middle, and end.

The plot is the first and most important thing in tragedy.

We become builders by building and lyre-players by playing the lyre.

What we have to learn to do, we learn by doing.

All art is an imitation of nature.

Art completes what nature cannot bring to finish.

Liars, when they speak the truth, are not believed.

Rhetoric is the faculty of observing in any given case the available means of persuasion.