This makes me think... about how my communion in the Eucharist is incomplete without communion with others

“Because there is one bread, we who are many are one body, for we all partake of the one bread” (1 Cor 10:17). 

Union with Christ is also union with all those to whom he gives himself. I cannot possess Christ just for myself; I can belong to him only in union with all those who have become, or who will become, his own. Communion draws me out of myself towards him, and thus also towards unity with all Christians. We become “one body”, completely joined in a single existence. Love of God and love of neighbour are now truly united: God incarnate draws us all to himself...

Eucharistic communion, includes the reality both of being loved and of loving others in turn. A Eucharist which does not pass over into the concrete practice of love is intrinsically fragmented. Conversely... the “commandment” of love is only possible because it is more than a requirement. Love can be “commanded” because it has first been given...

Anyone who needs me, and whom I can help, is my neighbour. The concept of “neighbour” is now universalized, yet it remains concrete... [it] calls for my own practical commitment here and now...

Jesus identifies himself with those in need, with the hungry, the thirsty, the stranger, the naked, the sick and those in prison. “As you did it to one of the least of these my brethren, you did it to me” (Mt 25:40). Love of God and love of neighbour have become one: in the least of the brethren we find Jesus himself, and in Jesus we find God.

--- Benedict XVI, encyclical, Deus Caritas Est ("God is Love"), 2005, par. 14, 15.