1. In acknowledging the centrality of love, Christian faith has retained the core of Israel's faith, while at the same time giving it new depth and breadth. The pious Jew prayed daily the words of the Book of Deuteronomy which expressed the heart of his existence: “Hear, O Israel: the Lord our God is one Lord, and you shall love the Lord your God with all your heart, and with all your soul and with all your might” (6:4-5). Jesus united into a single precept this commandment of love for God and the commandment of love for neighbour found in the Book of Leviticus: “You shall love your neighbour as yourself” (19:18; cf. Mk 12:29-31). Since God has first loved us (cf. 1 Jn 4:10), love is now no longer a mere “command”; it is the response to the gift of love with which God draws near to us..
18. Love of neighbour is thus shown to be possible in the way proclaimed by the Bible, by Jesus. It 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 neighbour 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 neighbour and to show him love makes me sensitive to God as well. Only if I serve my neighbour 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 neighbour from their encounter with the Eucharistic Lord, and conversely this encounter acquired its real- ism and depth in their service to others. Love of God and love of neighbour 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).
[Deus Caritas est, nn.1.18]
