SOUL

WHAT IS "SOUL?" Who can know what a soul is, much less what it "contains," if anything? This question arises from my reading of Plotinus, "Matter," THE ENNEADS (1991). In it he writes: "The Soul, for example, contains all things, but holds them in unextended unity; if magnitude were one of its attributes it would contain things in extension." P.100 Is soul collegial? everyone sharing one soul or is soul individual? each with its own soul? What is soul?