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thomas Meditations can be a tough slog. Pigliucci's "How to be a Stoic" is highly readable and gives you more grounding in philosophy. Also, Epictetus "The Art of Living" by Sharon Lebell (called an interpretation because she modernizes it) is terrific
Alex Try "Thoughts of a Philosophical Fighter Pilot" by James Bond Stockdale; he's one of the examples used in "The Obstacle is the Way."
Jen Targ Aside from Marcus Aurelius and Seneca, Enchiridion by Epictetus, A Guide to the Good Life by William Irvine (although most people, esp academics, rail against this one), and Albert Ellis' A Guide to Rational Living.