Failure to read what is happening in another's soul is not easily seen as a cause of unhappiness: but those who fail to attend the motions of their own soul are necessarily unhappy.

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.

He who does wrong does wrong against himself. He who acts unjustly acts unjustly to himself, because he makes himself bad.

Everything is only for a day, both that which remembers and that which is remembered. Observe constantly that all things take place by change, and accustom thyself to consider that the nature of the Universe loves nothing so much as to change the things which are and to make new things like them. For everything that exists is in a manner the seed of that which will be.

When pain is unbearable it destroys us; when it does not it is bearable.

The healthy eye ought to see all visible things and not to say, I wish for green things; for this is the condition of a diseased eye.

Past and future have no power over you. Just the present - and even that can be minimized.