https://en.wikisource.org/wiki/Moral_letters_to_Lucilius/Letter_18
Seneca recommended an exercise that I’ve found helpful:
“I am so firmly determined, however, to test the constancy of your mind that, drawing from the teachings of great men, I shall give you also a lesson: Set aside a certain number of days, during which you shall be content with the scantiest and cheapest fare, with coarse and rough dress, saying to yourself the while: “Is this the condition that I feared?”
It is precisely in times of immunity from care that the soul should toughen itself beforehand for occasions of greater stress, and it is while Fortune is kind that it should fortify itself against her violence. In days of peace the soldier performs maneuvers, throws up earthworks with no enemy in sight, and wearies himself by gratuitous toil, in order that he may be equal to unavoidable toil. If you would not have a man flinch when the crisis comes, train him before it comes. Such is the course which those men[4] have followed who, in their imitation of poverty, have every month come almost to want, that they might never recoil from what they had so often rehearsed.”
Seneca advocating for “LARPing as poor” (live action, role playing).
Similar concept to doing hard things and Michael Easter’s The Comfort Crisis book.
Rubens brought back this bust from Italy as a souvenir, thinking it was a bust of the Stoic philosopher Seneca. It was not a bust of him.