No outrage can come to us from others, but from ourselves

Bear in mind that it is not the man who reviles or strikes you that insults you, but it is your judgement that these men are insulting you. Therefore, when someone irritates you, be assured that it is your own opinion which has irritated you. And so make it your first endeavour not to be carried away by the external impression; for if once you gain time and delay, you will more easily become master of yourself.