Catechism of the Catholic Church §313 — excerpt
"We know that in everything God works for good for those who love him." The constant witness of the saints confirms this truth:
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.
Also cites: St. Catherine of Siena, Dialogue IV, 138 "On Divine Providence" · The Correspondence of Sir Thomas More, ed. Elizabeth F. Rogers (Princeton: Princeton University Press, 1947), letter 206, lines 661-663 · Julian of Norwich, the Revelations of Divine Love, tr. James Walshe SJ (London: 1961), ch. 32, 99-100