Letters from a Stoic

After Marcus Aurelius, this is one of my favorite books. While Marcus wrote mainly for himself, Seneca had no trouble advising and aiding others. In fact, that was his job—he was Nero’s tutor, tasked with reducing the terrible impulses of a terrible man. His advice on grief, on wealth, on power, on religion, and on life are always there when you need them.

I have read and learned a lot from Stoicism and in particular, Seneca's Letters from a stoic. It is an incredible guide, an operating system for the mind (as Tim Ferriss says) to put things in perspective, how to deal with hardship, and to generally operate in life.