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.

You are a little soul bearing about a corpse, as Epictetus used to say.

I am called to man's labour; why then do I make a difficulty if I am going out to do what I was born to do and what I was brought into the world for?

No one can lose either the past or the future - how could anyone be deprived of what he does not possess? ... It is only the present moment of which either stands to be deprived: and if this is all he has, he cannot lose what he does not have.

If any man can convince me and bring home to me that I do not think or act aright, gladly will I change; for I search after truth, by which man never yet was harmed. But he is harmed who abideth on still in his deception and ignorance.

How easy it is to repel and release every impression which is troublesome and immediately to be tranquil.

From Alexander the Platonic, not frequently nor without necessity to say to any one, or to write in a letter, that I have no leisure; nor continually to excuse the neglect of duties required by our relation to those with whom we live, by alleging urgent occupations.