Catechism of the Catholic Church §409 — excerpt
This dramatic situation of "the whole world [which] is in the power of the evil one" makes man's life a battle:
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: GS 37 3 2