I began this thread with the poser “What is the proper understanding of “Transubstantiation?”. For getting to the answer, it is a pre requisite to get a grip on “substance”.
I think we’re all agreed that post consecration, the many beings on the altar give way to one being (“The Being”, if you prefer). This change was ostensibly triggered off by a movement in the substance and this brings the focus very strongly onto that term. Anything that moves catches the eye. Now that the substance has moved, we have become aware of it and are trying to pin it down/understand it. In trying to understand something, it helps to analyse in what way it deviates from the rule (“Exception proves the rule” – Cicero).
The rule is that every being stands on two distinct legs, viz. existence and substance. The exception to the rule in the case of The Being is that it has no substance other than its existence. So this begs the question as to what makes it possible for The Being to defy the rule?
Let me give it a go:
In the case of The Being, He, being uncreated, doesn’t owe his existence to anybody outside of himself. In the case of all other beings, they owe their existence to an ‘outside player’, viz. The Being. In other words, all (created) beings have two factors in common, viz.: (a) the fact that they exist and (b) they have been conceptualized by somebody outside themselves. In the case of The Being, factor (a) is true but factor (b) is null. That’s why it is valid to say that in God (and only in God), existence and substance meet. If God had a substance distinct from his existence, then He wouldn’t be God, because it would imply that there is somebody outside of him who knows him completely!
And therefore, I come to a very sweet and simple explanation for “substance” of a being: It is the CONCEPT in the mind of God concerning that being. How God defines me in his mind constitutes my substance. First He conceptualizes me and then He gives me existence. "BEFORE I formed you in the womb I knew you, before you were born I set you apart; I appointed you as a prophet to the nations. (Jeremiah 1:5)” . A hat is a combination of many diverse beings, such as cardboard, felt, glue, etc., but the sum of their individual substances does not add up to the substance of the hat. A car is composed of about 30,000 components (beings), but the sum of their substances does not add up to the substance of the car. The hat and the car derive their respective substances not from the beings that go into their makeup, but directly from the mind of God. When God says that “Indeed, the very hairs of your head are all numbered… (Lk 12:7a)” it means that God has a distinct concept for every strand of hair. Same with each grain of sand on the seashore - that’s what gives them their respective substances and makes them distinct beings.
Is everybody with me up till here?