"The holy council teaches and openly and plainly professes that after the consecration of bread and wine, our Lord Jesus Christ, true God and true man, is truly, really and substantially contained in the august sacrament of the Holy Eucharist under the appearance of those sensible things." -Council of Trent
"Our holy faith teaches us, and we are bound to believe, that in the consecrated Host, Jesus Christ is really present under the species of bread. But we must also under stand that He is thus present on our altars as on a throne of love and mercy, to dispense graces, and there to show [...]
"By the consecration the transubstantiation of the bread and wine into the Body and Blood of Christ is brought about. Under the consecrated species of bread and wine Christ himself, living and glorious, is present in a true, real, and substantial manner: his Body and his Blood, with his soul and his divinity (cf. Council [...]
"After the Consecration God looks on the altar: 'There,' He says, 'is My well-beloved Son in whom I am well pleased.'" Source: St. John Vianney, The Meditations of the Curé D’Ars
"The Holy Mass consists of the words of Consecration. How wonderful it is! After the Consecration the good God is there as He is in heaven. If men really knew this mystery they would die of love. God has to spare us because of our weakness. The Holy Sacrifice is the same as that which [...]
"The priest consecrates this sacrament not by his own power, but as the minister of Christ, in Whose person he consecrates this sacrament." Source: St. Thomas Aquinas, Summa Theologica
"Such is the dignity of this sacrament that it is performed only as in the person of Christ. Now whoever performs any act in another's stead, must do so by the power bestowed by such a one. But as the power of receiving this sacrament is conceded by Christ to the baptized person, so likewise [...]
"When the bell rings you can say: 'What is there? The Body of Our Lord.' 'Why is it there? Because a priest has been there and said Mass.'" Source: St. John Vianney, The Meditations of the Curé D’Ars
"Let all vain ornament be banished, and every hurtful glance, and all wanton gait, and every flowing robe, and perfume enticing to pleasure. But in all for perfume let there be the prayer of sweet odour, and the practice of good works, and the sanctification of our bodies: that the Virgin-born Lord may say even [...]
"At the Consecration, the priest does not say: 'This is the Body of Our Lord.' He says: 'This is My Body.' See then the power of the priest! The tongue of the priest and a morsel of bread makes a God. It is more than the creation of the world. Someone said: 'St. Philomena obeys [...]