Hippodamus, son of Euryphon, a native of Miletus, invented the art of planning and laid out the street plan of Piraeus.

Again, it is possible to fail in many ways (for evil belongs to the class of the unlimited and good to that of the limited), while to succeed is possible only in one way (for which reason also one is easy and the other difficult—to miss the mark easy, to hit it difficult); for these reasons also, then, excess and defect are characteristic of vice, and the mean of virtue; For men are good in but one way, but bad in many.

...The entire preoccupation of the physicist is with things that contain within themselves a principle of movement and rest.

Emotions of any kind are produced by melody and rhythm; therefore by music a man becomes accustomed to feeling the right emotions; music has thus the power to form character, and the various kinds of music based on various modes may be distinguished by their effects on character.

The form of government is a democracy when the free, who are also poor and the majority, govern, and an oligarchy when the rich and the noble govern, they being at the same time few in number.

When the looms spin by themselves, we'll have no need for slaves.

We do not know a truth without knowing its cause.