today, while reading marcus aurelius' meditations*, i came across this quote, which i thought amusingly applicable to chess.
If you are doing your proper duty let it not matter to you whether you are cold or warm, whether you are sleepy or well-slept, whether men speak badly or well of you, even whether you are on the point of death or doing something else: because even this, the act in which we die, is one of the acts of life, and so here too it suffices to 'make the best move you can'.
* Tranlated by Martin Hammond, Introduction by Diskin Clay