He is the Head to which the whole Church is joined,
so that the Church is His Body, the completion of Him
who everywhere and in all things is complete. - Eph 1:22-23
“The Eucharist is equally
sign and cause of the unity
that binds together all members of the Lord's Mystical Body.
And this unity achieves in every Mass
its perfect expression,
because Christ’s far-flung members, together with Mary,
are conjoined with Him as offerer and offered alike.
Each time, then, that ‘we break this bread and drink this cup,’
the saints in heaven and the souls in purgatory
join hands and link hearts with us in worshipping
the Eucharistic Lord. And we have the privilege of co-worshipping
with such distinguished company because we are members of
that Church which is mothered by Our Lady of the Eucharist.”
Fr Richard Foley, S.J.
Mary and the Eucharist (pg. 115)
1419 Having passed from this world to the Father, Christ gives us in the Eucharist the pledge of glory with him. Participation in the Holy Sacrifice identifies us with his Heart, sustains our strength along the pilgrimage of this life, makes us long for eternal life, and unites us even now to the Church in heaven, the Blessed Virgin Mary, and all the saints. (From CCC, Catechism of the Catholic Church)