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 of the Catholic Church, #1324)

"'Behold,' says St. John, 'what manner of charity the Father hath bestowed upon us that we should be called and should be the sons of God (1 John 3:1)'. God is our Father. He loves us with a love which is incomprehensible. All the love which exists in the world comes from Him and is only a shadow of His charity which is without limit. 'Can a woman forget her infant?' asks the Lord through the mouth of the prophet; 'if she should forget, yet will not I forget thee (Isaiah 49:15)'. Now, love inclines one to the giving of self; accordingly it seeks a closer union with its object. God is love itself (cf. I John 4:8); He is moved by a desire ever active and intense to communicate Himself to us. That is why St. John writes: 'God so loved the world as to give His only begotten Son (John 3:16)'. This Son, Who shares the love of the Father, willed to accept the condition of a servant and to give Himself up on the Cross. 'Greater love has no man (John 15:13)'. And now, again, He hides Himself under the appearances of bread and wine, in order to enter into us and to unite us to Himself in the closest manner. The Holy Eucharist is the final effort of love which seeks to give itself; it is the prodigy of omnipotence in the service of infinite charity". (Blessed Marmion Clumba. Christ the Ideal of the Priest. Ignatius Press: San Francisco; 2005, 238.)