Who transforms the offerings into the body and blood of Christ?

St. John Chrysostom says , “Until now, Christ, who is attached to us, prepares the table Himself and sanctifies it. For it is not man who transforms the offerings into His body and blood, but Christ Himself who was crucified for us. The priest utters the words, but God's power and grace accomplish the sanctification. Christ says, ‘This is My body,’ and the offerings are sanctified.”¹⁵²⁴