"None (of the other sacraments) can be compared to the Eucharist… all this (Baptism, Reconciliation, Confirmation, Anointing of the Sick, Holy Orders and Marriage) seems to be only an apprenticeship to His love for men. In the adorable Sacrament of the Eucharist He goes much further." -St. John Vianney
"The Eucharist is 'the source and summit of the Christian life.' 'The other sacraments, and indeed all ecclesiastical ministries and works of the apostolate, are bound up with the Eucharist and are oriented toward it. For in the blessed Eucharist is contained the whole spiritual good of the Church, namely Christ himself, our Pasch.'" -Catechism [...]
"A sacrament is so termed because it contains something sacred. Now a thing can be styled sacred from two causes; either absolutely, or in relation to something else. The difference between the Eucharist and other sacraments having sensible matter is that whereas the Eucharist contains something which is sacred absolutely, namely, Christ's own body; the [...]
The Eucharist is "the source and summit of the Christian life.' "The other sacraments, and indeed all ecclesiastical ministries and works of the apostolate, are bound up with the Eucharist and are oriented toward it. For in the blessed Eucharist is contained the whole spiritual good of the Church, namely Christ himself, our Pasch." [...]
Absolutely speaking, the sacrament of the Eucharist is the greatest of all the sacraments... because it contains Christ Himself substantially. Source: ÿSt. Thomas Aquinas, Summa Theologica
"The Church's sacraments are ordained for helping man in the spiritual life. But the spiritual life is analogous to the corporeal, since corporeal things bear a resemblance to spiritual. Now it is clear that just as generation is required for corporeal life, since thereby man receives life; and growth, whereby man is brought to maturity: [...]
"And all these receive the same sacraments; and as they do, some are bathed in fiery brilliance, but the others are overshadowed by a dark cloud… those who are radiant with good deeds and receive it with devout mind and pure faith and illumined by the gift of the Holy Spirit for the salvation of [...]
"Since the whole mystery of our salvation is comprised in this sacrament, therefore is it performed with greater solemnity than the other sacraments. And since it is written (Eccles. 4:17): 'Keep thy foot when thou goest into the house of God'; and (Ecclus. 18:23): 'Before prayer prepare thy soul,' therefore the celebration of this mystery [...]
"Greater devotion is required in this sacrament [Eucharist] than in the others, for the reason that the entire Christ is contained therein. Moreover, this sacrament requires a more general devotion, i.e. on the part of the whole people, since for them it is offered; and not merely on the part of the recipients, as in [...]
"With all the greater reason, then, it is not permissible for us, in thought, life or action, to take away from this truly most holy Sacrament its full magnitude and its essential meaning. It is at one and the same time a Sacrifice-Sacrament, a Communion-Sacrament, and a Presence-Sacrament And, although it is true that the [...]