4.0

If you have not been properly introduced to the Stoics (which is highly likely the case considering that I degreed in philosophy and hadn't been until I was by Tim Ferriss, Ryan Holiday and William Irvine), then I recommend reading Ryan Holiday's book(s) (He wrote another on entitled Ego is the Enemy) on the subject. I also recommend William Irvine's A Guide to the Good Life: The Ancient Art of Stoic Joy.