Tolerance and apathy are the last virtues of a dying society.

There is only one way to avoid criticism: do nothing, say nothing and be nothing.

What is the essence of life? To serve others and to do good. Often given as a saying of Aristotle with no reference.

Man is a goal-seeking animal. His life only has meaning if he is reaching out and striving for goals.

It is the mark of an educated mind to be able to entertain a thought without accepting it.

The male has more teeth than the female in mankind, and sheep, and goats, and swine. This has not been observed in other animals.

But voice is a certain sound of that which is animated; for nothing inanimate emits a voice; but they are said to emit a voice from similitude, as a pipe, and a lyre, and such other inanimate things, have extension, modulation, and dialect; for thus it appears, because voice, also, has these.

It is not necessary to ask whether soul and body are one, just as it is not necessary to ask whether the wax and its shape are one, nor generally whether the matter of each thing and that of which it is the matter are one. For even if one and being are spoken of in several ways, what is properly so spoken of is the actuality.

That body is heavier than another which, in an equal bulk, moves downward quicker.

The least initial deviation from the truth is multiplied later a thousandfold.