It was funny prior to WYD. A study of 1 Cor 13 on "love" revealed the WYD theme in the Catechism in paragraph 735. It's the first paragraph listed in the Catechism with stuff under 1 Cor 13. See also at bottom: CCC 1826, 953 and 25.
CCC 735 He, then, gives us the "pledge" or "first fruits" of our inheritance: the very life of the Holy Trinity, which is to love as "God [has] loved us." 127 This love (the "charity" of 1 Cor 13) is the source of the new life in Christ, made possible because we have received "power" from the Holy Spirit. 128
128 Acts 1:8; cf. I Cor 13.
But you shall receive power when the Holy Spirit has come upon you; and you shall be my witnesses in Jerusalem and in all Judea and Samaria and to the end of the earth.
1 Corinthians 13
If I speak in the tongues of men and of angels, but have not love, I am a noisy gong or a clanging cymbal. And if I have prophetic powers and understand all mysteries and all knowledge, and if I have all faith, so as to remove mountains, but have not love, I am nothing. If I give away all I have, and if I deliver my body to be burned, but have not love, I gain nothing.
Love is patient and kind; love is not jealous or boastful; it is not arrogant or rude. Love does not insist on its own way; it is not irritable or resentful; it does not rejoice at wrong but rejoices in the right. Love bears all things, believes all things, hopes all things, endures all things.
Love never ends; as for prophecies, they will pass away; as for tongues, they will cease; as for knowledge, it will pass away. For our knowledge is imperfect and our prophesy is imperfect; but when the perfect comes, the imperfect will pass away. When I was a child, I spoke like a child, I thought like a child, I reasoned like a child; when I became a man, I gave up childish ways. For now we see in a mirror dimly, but then face to face. Now I know in part; then I shall understand fully, even as I have been fully understood. So faith, hope, love abide, these three; but the greatest of these is love.
1826 "If I . . . have not charity," says the Apostle, "I am nothing." Whatever my privilege, service, or even virtue, "if I . . . have not charity, I gain nothing." 103 Charity is superior to all the virtues. It is the first of the theological virtues: "So faith, hope, charity abide, these three. But the greatest of these is charity." 104
953 Communion in charity. In the sanctorum communio, "None of us lives to himself, and none of us dies to himself." 489 "If one member suffers, all suffer together; if one member is honored, all rejoice together. Now you are the body of Christ and individually members of it." 490 "Charity does not insist on its own way." 491 In this solidarity with all men, living or dead, which is founded on the communion of saints, the least of our acts done in charity redounds to the profit of all. Every sin harms this communion.
25 To conclude this Prologue, it is fitting to recall this pastoral principle stated by the Roman Catechism:
The whole concern of doctrine and its teaching must be directed to the love that never ends. Whether something is proposed for belief, for hope or for action, the love of our Lord must always be made accessible, so that anyone can see that all the works of perfect Christian virtue spring from love and have no other objective than to arrive at love."19