Augustine on the Eucharist

Christ was carried in his own hands when, referring to his own body, he said, ‘This is my body.’¹⁵ For he carried that body in his hands. – St. Augustine Explanations of the Psalms33:1:10

What you see is the bread and the chalice; that is what your own eyes report to you. But what your faith obliges you to accept is that the bread is the body of Christ and the chalice is the blood of Christ. – St. Augustine Sermons 272

 The Lord Jesus wanted those whose eyes were held lest they should recognize him, to recognize Him in the breaking of the bread¹⁰. The faithful know what I am saying. They know Christ in the breaking of the bread. For not all bread, but only that which receives the blessing of Christ, becomes Christ’s Body.” – St. Augustine Sermons 234:2

 You ought to know what you have received, what you are going to receive, and what you ought to receive daily. That Bread which you see on the altar, consecrated by the word of God, is the Body of Christ. That chalice, or rather, what the chalice holds, consecrated by the word of God, is the Blood of Christ. Through those accidents the Lord wished to entrust to us His Body and the Blood which He poured out for the remission of sins. – St. Augustine Sermons 227

see article here : http://www.calledtocommunion.com/2010/02/augustine-on-adams-body-and-christs-body-is-reformed-theology-truly-augustinian/
see article on church fathers in this regard  http://www.calledtocommunion.com/2010/12/church-fathers-on-transubstantiation/#comment-46465