Pope Paul VI Eucharistic Quotes:

"...St. John Chrysostom, who, as you know, treated of the eucharistic mystery with such nobility of language and insight born of devotion, instructing his faithful on one occasion about this mystery, expressed these most fitting words: "Let us submit to God in all things and not contradict Him, even if what He says seems contrary to our reason and intellect; rather let His words prevail over our reason and intellect. Let us act in this way with regard to the (eucharistic) mysteries, looking not only at what falls under our senses but holding on to His words. For His word cannot lead us astray." The scholastic Doctors often made similar affirmations: That in this sacrament are the true Body of Christ and His true Blood is something that "cannot be apprehended by the senses," says St. Thomas, "but only by faith which relies on divine authority. This is why, in a comment on Luke, 22,19: ('This is My Body which is given for you'), St. Cyril says: 'Do not doubt whether this is true, but rather receive the words of the Savior in faith, for since He is the truth, He cannot lie.'" Thus the Christian people, echoing the words of the same St. Thomas, frequently sing the words: "Sight, touch, and taste in Thee are each deceived, the ear alone most safely is believed. I believe all the Son of God has spoken-than truth's own word there is no truer token." In fact, St. Bonaventure asserts: "There is no difficulty about Christ's presence in the Eucharist as in a sign, but that He is truly present in the Eucharist as He is in heaven, this is most difficult. Therefore to believe this is especially meritorious." Moreover, the Holy Gospel alludes to this when it tells of the many disciples of Christ who, after listening to the sermon about eating His Flesh and drinking His Blood, turned away and left Our Lord, saying: "This is strange talk, who can be expected to listen to it?" Peter, on the other hand, in reply to Jesus' question whether also the twelve wished to leave, expressed his faith and that of the others promptly and resolutely with the marvelous answer: "Lord, to whom should we go? Thy words are the words of eternal life."

- Pope Paul VI, Mystery Of Faith, (Mysterium Fidei)

"It is called the real presence, not in an exclusive sense, as though other forms of presence were not real, but by reason of its excellence. It is the substantial presence by which Christ is made present without doubt, whole and entire, God and man."

- Pope Paul VI, quoted by the Bishops' conference of England and Wales, Ireland and Scotland, in describing the Real Presence of Jesus Christ in the Eucharist

"You also realize, Venerable Brothers, that the Eucharist is reserved
in churches or oratories to serve as the spiritual center of a religious
community or a parish community, indeed of the whole Church and the
whole of mankind, since it contains, beneath the veil of the species, Christ the
invisible Head of the Church, the Redeemer of the world, the center of
all hearts, 'by whom all things are and by whom we exist'."  (Pope Paul VI,
Mysterium Fidei, Art. 68)

"For He is in the midst of us day and night [in the Blessed Sacrament];
He dwells in us with the fullness of grace and truth.   He raises the
level of morals, fosters virtue, comforts the sorrowful, strengthens the weak and stirs up all
those who draw near to Him to imitate Him, so that they may learn from his
example to be meek and humble of heart, and to seek not their own interests but
those of God."  (Pope Paul VI, Mysterium Fidei, Art. 67)