Anaximenes and Anaxagoras and Democritus say that its [the earth's] flatness is responsible for it staying still: for it does not cut the air beneath but covers it like a lid, which flat bodies evidently do: for they are hard to move even for the winds, on account of their resistance.

In the works of Nature, purpose, not accident, is the main thing.

For often, when one is asleep, there is something in consciousness which declares that what then presents itself is but a dream.

For nature by the same cause, provided it remain in the same condition, always produces the same effect, so that either coming-to-be or passing-away will always result.

Excellence is never an accident. It is always the result of high intention, sincere effort, and intelligent execution; it represents the wise choice of many alternatives - choice, not chance, determines your destiny.

The more you know, the more you know you don't know.

Thinking is different from perceiving and is held to be in part imagination, in part judgment