A quote
My soul is a living thing, and so am I; but we are not two separate persons. And why? Because the soul is part of myself. It will only be reckoned as a definite thing in itself, when it shall exist by itself. But as long as it shall be part of another, it cannot be regarded as different. And why? I will tell you: it is because that which is different, must be personal and peculiar to itself, a whole, and complete within itself.
Seneca·Letter 113 — On the Vitality of the Soul and Its Attributes (§5)·trans. Gummere