Letters 13.6

Do me the favour, when men surround you and try to talk you into believing that you are unhappy, to consider not what you hear but what you yourself feel, and to take counsel with your feelings and question yourself independently, because you know your own affairs better than anyone else does. Ask: “Is there any reason why these persons should condole with me? Why should they be worried or even fear some infection from me, as if troubles could be transmitted? Is there any evil involved, or is it a matter merely of ill report, rather than an evil?” Put the question voluntarily to yourself: “Am I tormented without sufficient reason, am I morose, and do I convert what is not an evil into what is an evil?”

Seneca, Letters to Lucilius 13.6, translated by Richard Mott Gummere