Plotinos: Complete Works, v. 4 In Chronological Order,...

We will set aside as impossible the mixture of two incommensurables, such as a line and the color called white. A mixture of the soul and body, which must imply their commensurability, would demand explanation. Even if the soul interpenetrate the body, the soul need not share the body's passions, for the interpenetrating medium may remain impassible; as light, which remains such in spite of its diffusion.288 Thus the soul might remain a stranger to the body's passions, though diffused through it, and need not necessarily undergo its passions.