All persons ought to endeavor to follow what is right, and not what is established.

In inventing a model we may assume what we wish, but should avoid impossibilities.

No one will dare maintain that it is better to do injustice than to bear it.

Health is a matter of choice, not a mystery of chance

...the life which is best for men, both separately, as individuals, and in the mass, as states, is the life which has virtue sufficiently supported by material resources to facilitate participation in the actions that virtue calls for.

What we know is not capable of being otherwise; of things capable of being otherwise we do not know, when they have passed outsideour observation, whether they exist or not. Therefore the object of knowledge is of necessity. Therefore it is eternal; for things that are of necessity in the unqualified sense are all eternal; and things that are eternal are ungenerated and imperishable.

It is Homer who has chiefly taught other poets the art of telling lies skillfully.