"My formula for greatness in a human being is amor fati: that one wants nothing to be different, not forward, not backward, not in all eternity. Not merely bear what is necessary, still less conceal it...but love it." - Friedrich Nietzsche (via Ecce Homo)
"I want to learn more and more to see as beautiful what is necessary in things; then I shall be one of those who makes things beautiful. Amor fati: let that be my love henceforth! I do not want to wage war against what is ugly. I do not want to accuse; I do not even want to accuse those who accuse. Looking away shall be my only negation." - Friedrich Nietzsche (via The Gay Science)
Similar quote from Epictetus:
"Do not seek for things to happen the way you want them to; rather, wish that what happens happen the way it happens: then you will be happy."
And another similar quote from Nassim Taleb in Fooled by Randomness:
"Having control over randomness can be expressed in the manner in which one acts in the small and the large. Recall that epic heroes were judged by their actions, not by the results. No matter how sophisticated our choices, how good we are at dominating the odds, randomness will have the last word…..There is nothing wrong and undignified with emotions—we are cut to have them. What is wrong is not following the heroic or, at least, the dignified path. That is what stoicism truly means. It is the attempt by man to get even with probability…..stoicism has rather little to do with the stiff-upper-lip notion that we believe it means…..The stoic is a person who combines the qualities of wisdom, upright dealing, and courage. The stoic will thus be immune from life’s gyrations as he will be superior to the wounds from some of life’s dirty tricks."