Every organism is a One in Many. The more perfect the organism, the more perfect the unity, as St Thomas says, i.e., the more perfect the central control. And this central control again is more perfect, the greater the variety and multiplicity and power of subordinates over which this unifying control effectually extends. In the lowest types of creatures, we get either multiplicity with little of unity, as in a heap of stones, e.g., the moraine on the side of a high hill; or unity with little of multiplicity, as in the first elements of matter, -- 'electrons,' or what ever else they may be. God, the Sovereign Unity, is likewise virtually all things (B. I, Chapp. XXXI, LIII, LIV).
Of God and His Creatures: 4.1