Zeno is the founder of Stoicism, a school of Hellenistic philosophy founded in Athens by Zeno of Citium in the early 3rd century BC. Stoicism is a system of ethics that emphasizes the development of self-control and fortitude as a means of overcoming destructive emotions. Zeno taught that we should accept our fate and live in harmony with the divine order of the universe. He believed that we should strive to be free from passion, unmoved by joy or grief, and submit to natural law.