For [the ancient writers] say that in consecration a secret conversion takes place, so that there is now something other than bread and wine… they do not mean by this that the elements have been annihilated, … but rather that they now have to be considered of a different class from common foods intended solely to feed the stomach, since in them is set forth the spiritual food and drink of the soul. This we do not deny. If they mean that it is made something which it was not before, I agree.
– Calvin