To Unlearn is as hard as to Learn

Every virtue is a mean between two extremes, each of which is a vice.

The wise man does not expose himself needlessly to danger, since there are few things for which he cares sufficiently; but he is willing, in great crises, to give even his life - knowing that under certain conditions it is not worthwhile to live.

I have gained this from philosophy: that I do without being commanded what others do only from fear of the law.

For both excessive and insufficient exercise destroy one's strength, and both eating and drinking too much or too little destroy health, whereas the right quantity produces, increases and preserves it. So it is the same with temperance, courage and the other virtues. This much then, is clear: in all our conduct it is the mean that is to be commended.

The worst thing about slavery is that the slaves eventually get to like it.

The greatest virtues are those which are most useful to other persons.