Catechism of the Catholic Church §220 — excerpt
God's love is "everlasting": "For the mountains may depart and the hills be removed, but my steadfast love shall not depart from you." Through Jeremiah, God declares to his people, "I have loved you with an everlasting love; therefore I have continued my faithfulness to you."
This translation is under copyright, so only the cited words are quoted here. Follow the link for the full text. Translation: English translation of the Catechism of the Catholic Church, 2nd ed. (Libreria Editrice Vaticana), as posted at vatican.va.