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."

Catechism of the Catholic Church, 1324

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Catechism on the Eucharist

It is highly fitting that Christ should have wanted to remain present to his Church in this unique way. Since Christ was about to take His departure from His own in His visible form, He wanted to give us His sacramental presence; since He was about to offer Himself on the cross to save us, He wanted us to have the memorial of the love with which He loved us 'to the end,' even to the giving of His life. In His Eucharistic presence he remains mysteriously in our midst as the one who loved us and gave Himself up for us, and He remains under signs that express and communicate this love. The Church and the world have a great need for Eucharistic worship. Jesus awaits us in this sacrament of love. Let us not refuse the time to go to meet Him in adoration, in contemplation full of faith, and open to making amends for the serious offenses and crimes of the world. Let our adoration never cease.

Catechism of the Catholic Church, 1380

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Catechism on Eucharistic Adoration