This document discusses what can be known about God through natural reason and supernatural revelation. It explains that natural reason leads to knowledge of God as the creator and orderer of the world, while supernatural revelation from God provides knowledge that is beyond natural reason, such as the Trinity and salvation through Jesus Christ. This revelation started with Adam and Eve, was prepared for by pre-Christian revelation, and was completed through Jesus Christ and the apostles in the Bible and Sacred Tradition. The document outlines the books of the Old and New Testaments and describes the four Gospels and roles of their authors. It also discusses the Church's Magisterium, whose role is to faithfully teach and interpret the deposit of divine revelation.