Love of neighbor… in the way proclaimed by the Bible, by Jesus… consists in the very fact that, in God and with God, I love even the person whom I do not like or even know. This can only take place on the basis of an intimate encounter with God, an encounter which has become a communion of will, even affecting my feelings. Then I learn to look on this other person not simply with my eyes and my feelings, but from the perspective of Jesus Christ. His friend is my friend. Going beyond exterior appearances, I perceive in others an interior desire for a sign of love, of concern. This I can offer them not only through the organizations intended for such purposes, accepting it perhaps as a political necessity. Seeing with the eyes of Christ, I can give to others much more than their outward necessities; I can give them the look of love which they crave. Here we see the necessary interplay between love of God and love of neighbor which the First Letter of John speaks of with such insistence. If I have no contact whatsoever with God in my life, then I cannot see in the other anything more than the other, and I am incapable of seeing in him the image of God. But if in my life I fail completely to heed others, solely out of a desire to be “devout” and to perform my “religious duties,” then my relationship with God will also grow arid. It becomes merely “proper,” but loveless. Only my readiness to encounter my neighbor and to show him love makes me sensitive to God as well. Only if I serve my neighbor can my eyes be opened to what God does for me and how much he loves me. The saints—consider the example of Blessed Teresa of Calcutta—constantly renewed their capacity for love of neighbor from their encounter with the Eucharistic Lord, and conversely this encounter acquired its realism and depth in their service to others. Love of God and love of neighbor are thus inseparable, they form a single commandment. But both live from the love of God who has loved us first. No longer is it a question, then, of a “commandment” imposed from without and calling for the impossible, but rather of a freely-bestowed experience of love from within, a love which by its very nature must then be shared with others. Love grows through love. Love is “divine” because it comes from God and unites us to God; through this unifying process it makes us a “we” which transcends our divisions and makes us one, until in the end God is “all in all” (1 Cor 15:28).

Pope Benedict XVI, Deus Caritas Est, paragraph 18

Part of the miracle of the Eucharist, when I consider it personally, is the astonishing fact that it reveals that even I have been invited into the embrace of the love that made the universe. Who am I to receive such a gift? And who am I to hesitate even a moment in desiring to share that unmerited gift with others?

C.S. Lewis says it succinctly in the final words of his essay The Weight of Glory:

…It is immortals whom we joke with, work with, marry, snub, and exploit—immortal horrors or everlasting splendors. This does not mean that we are to be perpetually solemn. We must play. But our merriment must be of that kind (and it is, in fact, the merriest kind) which exists between people who have, from the outset, taken each other seriously—no flippancy, no superiority, no presumption. And our charity must be a real and costly love, with deep feeling for the sins in spite of which we love the sinner—no mere tolerance or indulgence which parodies love as flippancy parodies merriment. Next to the Blessed Sacrament itself, your neighbor is the holiest object presented to your senses. If he is your Christian neighbor he is holy in almost the same way, for in him also Christ vere latitat—the glorifier and the glorified, Glory Himself, is truly hidden.

Before this great mystery, let all mortal flesh keep silence.