
"A magisterial mappa mundi of the terrain that Pierre Hadot has so productively worked for decades, this ambitious work revises our view of ancient philosophy—and in doing so, proposes that we change the way we see philosophy itself. Hadot takes ancient philosophy out of its customary realm of names, dates, and arid abstractions and plants it squarely in the thick of life. Through a meticulous historical reading, he shows how the various schools, trends, and ideas of ancient Greek and Roman philosophy all tended toward one goal: to provide a means for achieving happiness in this life, by transforming the individual’s mode of perceiving and being in the world. Most pressing for Hadot is the question of how the ancients conceived of philosophy. He argues in great detail, systematically covering the ideas of the earliest Greek thinkers, Hellenistic philosophy, and late antiquity, that ancient philosophers were concerned not just to develop philosophical theories, but to practice philosophy as a way of life—a way of life to be suggested, illuminated, and justified by their philosophical “discourse.” For the ancients, philosophical theory and the philosophical way of life were inseparably linked. What Is Ancient Philosophy? also explains why this connection broke down, most conspicuously in the case of academic, professional philosophers, especially under the influence of Christianity. Finally, Hadot turns to the question of whether and how this connection might be reestablished.
I'm not a big fan of Guide to the Good Life either -- mostly because I think it takes a very profound (and by no means simple or obvious) set of ideas and reduces it to a kind of intellectual fad diet.
For something weightier, you might look at the works of Pierre Hadot (Philosophy as a Way of Life and What is Ancient Philosophy?), both of which contain excellent discussions of stoicism.
• "Many people grasp and hold on to life, like those caught by a flash flood who grasp at weeds and brambles. Most are tossed about between the fear of death and the torments of life: they do not want to live but do not know how to die. Cast off your solicitude for life, then, and in doing so make life enjoyable for yourself. No good thing benefits us while we have it unless we are mentally prepared for the loss of it." — Seneca
• "Epicurus says 'It is a fine thing to learn death thoroughly.' Perhaps you think it is a waste of time to learn something you will need to use only once. But that is the very reason we ought to rehearse: if we cannot test whether we know it, we should be learning it always." — Seneca riffing on Epicurus (not to be confused with Epictetus, a Stoic; he even has a discourse titled "Against Epicurus")
• "As the water clock does not empty out its last drop only but also whatever dripped through it before, so our last hour of existence is not the only time we die but just the only time we finish dying. Death is not one event; the death that takes us is our last." — Seneca
• "Years are not given out by quota. There's no way to know the point where death lies waiting for you, you must wait for death at every point." — Seneca
• "Let death be before your eyes every day, and you will never have a base thought or an excessive desire." — Marcus Aurelius
• "The torment we feel comes about through our own agency, because we become alarmed when we believe that death is close at hand. But isn't it close to everyone, ready in place and every moment?" — Seneca
• "Think about arranging the present as best as you can, with serene mind. All else is carried away as by a river." — Horace
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Sources for quotations: Seneca's 'Letters on Ethics' (full set of letters, excellently translated by Graver and Long); the others are from 'What is Ancient Philosophy?' by Pierre Hadot.