A man should always have these two rules in readiness. First, to do only what the reason of your ruling and legislating faculties suggest for the service of man. Second, to change your opinion whenever anyone at hand sets you right and unsettles you in an opinion, but this change of opinion should come only because you are persuaded that something is just or to the public advantage, not because it appears pleasant or increases your reputation.

This is the mark of a perfect character - to pass through each day as though it were the last, without agitation, without torpor, and without pretense.

A good man does not spy around for the black spots in others, but presses unswervingly on towards his mark.

All things change, and you yourself are constantly wasting away. So also is the universe.

Hast thou reason? I have. Why then dost not thou use it? For if this does its own work, what else dost thou wish?

So much worse are the consequences of anger than its causes.

The happiness of your life depends upon the quality of your thoughts.