v4mp 's Key Ideas from Meditations
by Marcus Aurelius

Marcus Aurelius Antoninus was Roman emperor from 161 to 180 and a Stoic philosopher. He was the last of the rulers known as the Five Good Emperors, and the last emperor of the Pax Romana, an age of relative peace and stability for the Roman Empire lasting from 27 BCE to 180 CE. He was born in 121 AD Rome, Italy

Of the doctrines central to the Stoic worldview, perhaps the most important is the unwavering conviction that world is organised in a rational and coherent way. More specifically it is controlled and directed by an all-prevading force that the Stoics designated by the term logos. The term (from which English "logic" and the suffix "-logy" derive) has a semantic range so broad as to be almost untranslatable.

In simple words,

Stoicism is from the outset a deterministic system that appears to leave no room for human free-will or moral responsibility.