From the USCCB
The Real Presence of Jesus Christ in the Sacrament of the Eucharist: Basic Questions and Answers
He transforms the bread into His body to be #TrulyPresent
If the word of the Lord Jesus is so powerful as to bring into existence things which were not, then a fortiori those things which already exist can be changed into something else.
-St. Ambrose, De Sacramentis, IV, 5-16
