- “The world is a living organism, an infinite living being, which contains all living beings within it.” — Marcus Aurelius
- “The universe is transformation; our life is what our thoughts make it.” — Marcus Aurelius
- “The universe is a single living creature, embracing all living creatures within itself.” — Marcus Aurelius
- “Nature does nothing in vain, and so whatever is, is for the sake of something else.” — Marcus Aurelius
- “Everything that happens in the world happens in accordance with the nature of the whole, and this nature is a rational one.” — Epictetus
- “The nature of the universe is rational, and there is a single, divine plan that governs everything that happens within it.” — Epictetus
- “The universe is an intelligent and rational being, and all things that happen within it are in accordance with its nature.” — Epictetus
Overall, Stoic philosophy emphasizes the idea that the universe is a rational and orderly place, governed by natural laws. Nature is seen as an integral part of this order, and is understood to be a living organism in which all living beings are connected and interdependent. As such, Stoics believe that we should strive to align our own lives with the natural order of things, and to live in harmony with the universe and with one another.