... a science must deal with a subject and its properties.

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

These two rational faculties may be designated the Scientific Faculty and the Calculative Faculty respectively; since calculation is the same as deliberation, and deliberation is never exercised about things that are invariable, so that the Calculative Faculty is a separate part of the rational half of the soul.

He who is unable to live in society, or who has no need because he is sufficient for himself, must be either a beast or a god.

As the pleasures of the body are the ones which we most often meet with, and as all men are capable of these, these have usurped the family title; and some men think these are the only pleasures that exist, because they are the only ones which they know.

The beginning of reform is not so much to equalize property as to train the noble sort of natures not to desire more, and to prevent the lower from getting more.

Music imitates (represents) the passions or states of the soul, such as gentleness, anger, courage, temperance, and their opposites.