The Stoics strongly believed in Sympatheia—mutual interdependence and oneness among everything in the universe. They saw themselves as part of a cosmic web, and that their actions had ripple effects on the world around them. They believed that the universe is governed by a rational and benevolent force, which they called Logos. They also believed that each individual has a spark of the divine within them, and that we can all live in harmony with the Logos. To live in harmony with the Logos, the Stoics believed that we must cultivate the four cardinal virtues: wisdom, justice, courage, and moderation. And that we must accept what we cannot control, and focus on what we can control. The Stoics believed that we could achieve eudaimonia - a state of inner peace and tranquility that is not dependent on external circumstances - by practicing the four cardinal virtues. “Constantly think of the universe as one living creature, embracing one being and soul; how all is absorbed into the one consciousness of this living creature; how it compasses all things with a single purpose, and how all things work together to cause all that comes to pass, and their wonderful web and texture.” — Marcus Aurelius, Meditations, 4.40