Happiness is an activity of the soul in accordance with virtue

But the whole vital process of the earth takes place so gradually and in periods of time which are so immense compared with the length of our life, that these changes are not observed, and before their course can be recorded from beginning to end whole nations perish and are destroyed.

The student of politics therefore as well as the psychologist must study the nature of the soul.

Once more: there are three offices according to whose directions the highest magistrates are chosen in certain states - guardians of the law, probuli, councilors - of these, the guardians of the law are an aristocratical, the probuli an oligarchical, the council a democratical institution.

Music directly represents the passions of the soul. If one listens to the wrong kind of music, he will become the wrong kind of person.

Both oligarch and tyrant mistrust the people, and therefore deprive them of their arms.

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.