Marcus Aurelius reminds us in this text from his Meditations that everything you experience, including your own existence, is in constant flux. Your sensations, which are often deceptive, offer you only a limited view of reality.
And yet, in the midst of this impermanence, there is an anchor, a constancy that you can achieve, and that is through philosophy. But not through a philosophy that is bogged down in fuzzy and intellectual abstractions; but through a lived philosophy that is practiced every day in the deep awareness that you are part of a greater whole.
This philosophy,
is stoicism.