Catechism of the Catholic Church §2834 — excerpt
"Pray and work." "Pray as if everything depended on God and work as if everything depended on you." Even when we have done our work, the food we receive is still a gift from our Father; it is good to ask him for it with thanksgiving, as Christian families do when saying grace at meals.
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. Benedict Regula, 20, 48 · Attributed to St. Ignatius Loyola, cf. Joseph de Guibert, SJ, The Jesuits: Their Spiritual Doctrine · Practice, (Chicago: Loyola University Press, 1964), 148, n. 55