Manual para una vida feliz - Epictetus

So – a true philosopher is under no obligation to respect vulgar opinion as to what is religious or irreligious, what is just or unjust. What dishonour he brings on philosophers in general if he did! That’s not what you learned here.

Getting rid of these, too, requires looking to God for help, trusting him alone, and submitting to his direction. [47] Then if you’re not willing to do this – all tears and agitation – you will serve someone physically more powerful than you, and continue to look outside yourself for happiness, fated never to find it. And that is because you look for it in the wrong place, forgetting to look where it really lies.

If a man, said Epictetus, opposes evident truths, it is not easy to find arguments by which we shall make him change his opinion. But this does not arise either from the man's strength or the teacher's weakness; for when the man, though he has been confuted, is hardened like a stone, how shall we then be able to deal with him by argument?