Catechism of the Catholic Church §2460 — excerpt
The primordial value of labor stems from man himself, its author and beneficiary. By means of his labor man participates in the work of creation.
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.