Natural Wealth: The Applications of Stoic & Chinese Medicine Principles.
Seneca Letter 118: “there is no advice I would rather give you than this, which no one can hear too often: you should measure everything by your natural desires, which can be satisfied either at no cost, or only a little. Just don't mingle those desires with vices”
“of all the gifts nature has given us, this is the finest: real need is not particular. What is superfluous admits of choice:….”