Characteristics of the rational soul: Self-perception, self-examination, and the power to make of itself whatever it wants. … It surveys the world and the empty space around it, and the way it’s put together. It delves into the endlessness of time to extend its grasp and comprehension of the periodic births and rebirths that the world goes through. It knows that those who came after us will see nothing different, that those who came before us saw no more than we do, and that anyone with forty years behind him and eyes in his head has seen both past and future—both alike.

~ Marcus Aurelius