This is a lesson about the concept of Revelation, which is God's communication with humanity. It distinguishes between Natural Revelation (God revealing himself through creation) and Supernatural Revelation (God revealing himself directly, primarily through Jesus Christ). The lesson explains the importance of Sacred Tradition and Sacred Scripture, as well as the role of the Magisterium in interpreting these sources. It concludes by defining mysteries and dogmas, emphasizing the importance of faith and obedience to God.