"The mountain of the LORD's house shall be established as the highest mountain
and raised above the hills.  All nations shall stream toward it." (Isaiah 2:2)

Liturgy is an "action" of the whole Christ (Christus Totus). Those who even now celebrate it without signs are already in the heavenly liturgy, where celebration is wholly communion and feast.(CCC 1136)

The Eucharist is "the source and summit of the Christian life." (CCC 1324)