Daily Eucharist Quote – St. Thomas Aquinas

“Consequently, no natural or created agent can act except by changing the form in something; and on this account every change made according to nature’s laws is a formal change. But God is infinite act… hence His action extends to the whole nature of being. Therefore He can work not only formal conversion, so that diverse forms succeed each other in the same subject; but also the change of all being, so that, to wit, the whole substance of one thing be changed into the whole substance of another. And this is done by Divine power in this sacrament; for the whole substance of the bread is changed into the whole substance of Christ’s body, and the whole substance of the wine into the whole substance of Christ’s blood. Hence this is not a formal, but a substantial conversion; nor is it a kind of natural movement: but, with a name of its own, it can be called ‘transubstantiation.'”