Why is it important to have such a philosophy? Because without one, there is a danger that you will mislive—that despite all your activity, despite all the pleasant diversions you might have enjoyed while alive, you will end up living a bad life.
Thus, the second component of a philosophy of life is a strategy for attaining your grand goal in living.
according to the Stoic philosopher Seneca, about whom I will have much to say in this book, “He who studies with a philosopher should take away with him some one good thing every day: he should daily return home a sounder man, or on the way to become sounder.”
The Stoics realized that a life plagued with negative emotions—including anger, anxiety, fear, grief, and envy—will not be a good life.