“Every habit and capability is confirmed and grows in it corresponding actions, walking by walking, and running by running… therefore, if you want to do something make a habit of it, if you don’t want to do that, don’t, but make a habit of something else instead. The same principle is at work in our state of mind. When you get angry, you’ve not only experienced that evil, but you’ve also reinforced a bad habit, adding fuel to the fire.”

Epictetus, Discourses, The Daily Stoic (Page 147)