There is one identical Soul, every separate manifestation being that Soul complete. The differentiated souls issue from the Unity and strike out here and there, but are united at the Source much as light is a divided thing on earth, shining in this house and that, and yet remains one. One Soul [is] the source of all souls; It is at once divided and undivided. (1) ... Diversity within the ONE depends not upon spatial separation, but sheerly upon differentiation; all Being, despite this plurality, is a Unity still. (2) ... The souls are apart without partition; they are no more hedged off by boundaries than are the multiple items of knowledge in one mind. The one Soul so exists as to include all souls. (3)

(Plotinus)