34 This truth had already been wisely explained by Our Predecessor St. Pius X in his Encyclical Letter Singulari quadam of September 24, 1912, in which he made this statement: "All actions of a Christian man so far as they are morally either good or bad - that is, so far as they agree with or are contrary to the natural and divine law - fall under the judgment and jurisdiction of the Church."
Source: Ad Apostolorum Principis (Vatican.va)