The Credo on the Eucharist by Pope Gregory VII (1020–1085)

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"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."

Amen. I profess, I confess, I believe.