More from Calvin in the anti-Heshusius tract:
Moreover, I do not interpret this communion of flesh and blood as applying only to the common nature, in respect that Christ, by becoming man, made us sons of God with himself by virtue of fraternal fellowship; but I distinctly affirm, that our flesh which he assumed is vivifying by becoming the material of spiritual life to us. And I willingly embrace the saying of Augustine, As Eve was formed out of a rib of Adam, so the origin and beginning of life to us flowed from the side of Christ. And although I distinguish between the sign and the thing signified, I do not teach that there is only a bare and shadowy figure, but distinctly declare that the bread is a sure pledge of that communion with the flesh and blood of Christ which it figures. For Christ is neither a painter, nor a player, nor a kind of Archimedes, who presents an empty image to amuse the eye, but he truly and in reality performs what he promises by an external symbol.