Roman Catechism 9.13

Chapter 9 — Part I: The Creed — Article VII: From Thence He Shall Come to Judge the Living and the Dead

Section 13. Besides, it was right that the just should be encouraged by the hope, the wicked appalled by the terror, of a future judgment; so that knowing the justice of God the former should not be disheartened, while the latter through fear and expectation of eternal punishment might be recalled from the paths of vice. Hence, speaking of the last day, our Lord and Saviour declares that a general judgment will one day take place, and He describes the signs of its approach, that seeing them, we may know that the end of the world is at hand. At His Ascension also, to console His Apostles, overwhelmed with grief at His departure, He sent Angels, who said to them: This Jesus who is taken up from you into heaven, shall so come, as you have seen him going into heaven