“When I see a man anxious, I say, “What does this man want? If he did not want something which is not in his power, how could he be anxious?” For this reason a lute player when he is singing by himself has no anxiety, but when he enters the theatre, he is anxious even if he has a good voice and plays well on the lute; for he not only wishes to sing well, but also to obtain applause: but this is not in his power.”

- Epictetus