Epictetus, on Happiness and Freedom

"Some things are in our control and others not. Things in our control are opinion, pursuit, desire, aversion, and, in a word, whatever are our own actions. Things not in our control are body, property, reputation, command, and, in one word, whatever are not our own actions."

- Epictetus, Enchiridion 1.1

Finn spending some quality time with the Enchiridion in
Adventure Time S7e23, "Crossover."