Letters from a Stoic is a selection from the 124 surviving Moral Letters to Lucilius, written by the Roman statesman and playwright Lucius Annaeus Seneca in the last years of his life, after his withdrawal from Nero's court.
Each letter takes a single practical problem — a noisy apartment above a bathhouse, the death of a friend, the fear of poverty, the temptation of a crowd — and works it until something usable falls out. They are short. Most can be read in five minutes.
Seneca is the most companionable of the Stoics and the least severe. Where Epictetus instructs and Marcus Aurelius interrogates himself, Seneca persuades. He is also the one who wrote most directly about money, status and time, which is why he has outlasted his own reputation.