Following are words of the teachers of two different religions.
One is Catholic.
The other is an heretic.
Can you name the authors?
First, the Catholic:
"I believe in my heart and openly profess that the bread and wine placed upon the altar are, by the mystery of the sacred prayer and the words of the Redeemer, substantially changed into the true and life-giving flesh and blood of Jesus Christ our Lord, and that after the consecration there is present the true body of Christ which was born of the Virgin and offered up for the salvation of the world, hung on the cross and now sits at the right hand of the Father, and that there is present the true blood of Christ which flowed from His side. They are present not only by means of a sign and of the efficacy of the sacrament, but also in the very reality and truth of their nature and substance."
Then, the heretic:
“In reality, body and blood of Christ does not signify the physical parts of the man Jesus during his life or in his glorified body. Body and blood here signifies specifically the presence of Christ in the symbolism of bread and wine. …
“We now have communion with Jesus Christ, through the eating and drinking of the bread and wine. Just as in an interpersonal relationship, a letter can show the friendship between persons and illustrate the affection of the sender for the recipient.” ...
“The nature of these gifts can be clarified only in their relation to man.The essence of the bread and the wine, therefore, must be defined in an anthropological way. The natural character of these offerings [bread and wine] as a fruit of the earth and the work of human hands, as units of natural and cultural products, is to strengthen and nourish man and the human community in the character of a common meal. … This natural essence of the bread and wine is transformed by God in the sense that this nature of bread and wine now shows and achieves salvific communion with God.”