The best and the greatest number of authors have asserted that philosophy consists of three parts: the moral, the natural, and the rational. The first puts the soul in order. The second thoroughly examines the natural order of things. The third inquires into the proper meaning of words, and their arrangements and proofs which keep falsehoods from creeping in to displace truth.
—Seneca, Moral Letters, 89.9
These three parts—the moral, the natural, and the rational—have one aim. As different as they are, they have the same purpose: to help you live a good life ruled by reason.
Not in the future, but right now.
* Source: The Daily Stoic by Ryan Holiday and Stephen Hanselman