Here’s an excerpt from Seneca’s Letter II to Lucilius (Seneca: Letters from a Stoic; Selected and Translated by Robin Campbell; Page 34):
After running over a lot of different thoughts, pick out one to be digested thoroughly that day. This is what I do myself; out of the many bits I have been reading I lay hold of one. My thought for today is something which I found in Epicurus (yes, I actually make a practice of going over the enemy’s camp—by way of reconnaissance, not as a deserter!). ‘A cheerful poverty,’ he says, ‘is an honorable state.’ But if it is cheerful it is not poverty at all.