"There is only one light of the sun,
though it is intercepted by walls and mountains
and thousands of other objects.
There is only one common substance of the whole world,
though it is restrained in an infinite number
of different forms or bodies.
There is only one common soul,
though it is divided into innumerable
particular essences and natures.
There is only one mind,
though it seems to be divided..."
-Marcus Aurelius, Emperor of Rome.