"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." Source: St. John Vianney, The Meditations of the [...]
St. Thomas discusses a spiritual Communion, where we are unable to receive the Eucharist, but through a true desire for union with Christ, we can receive spiritually. Ideally, we would go to Mass every day and receive the Blessed Sacrament every day, but for most, that is not possible. Instead, we can desire and seek [...]
"Incorporation into Christ, which is brought about by Baptism, is constantly renewed and consolidated by sharing in the Eucharistic Sacrifice, especially by that full sharing which takes place in sacramental communion. We can say not only that each of us receives Christ, but also that Christ receives each of us." Source: Pope St. John [...]
"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 holy Eucharist completes Christian initiation. Those who have been raised to the dignity of the royal priesthood by Baptism and configured more deeply to Christ by Confirmation participate with the whole community in the Lord's own sacrifice by means of the Eucharist. Source: Catechism of the Catholic Church #1322