God's revelation was handed on by Jesus and his apostles through Sacred Scripture (the Bible) and Sacred Tradition. But what is this Tradition, and how does it come to us? Dr. Schreck explores that question, highlighting the role of the teaching office of the Church—the Magisterium—in handing on, safeguarding, and authoritatively interpreting God's revealed truth in Sacred Scripture and Tradition.

Dr. Schreck reviews how God has revealed himself through the material order (or "natural revelation") and how God as creator has been confirmed by scientific discoveries in the past 100 years. He also talks about God's direct revelation in history (or "divine revelation")—from God's manifestation in word and deed to the Hebrew people to his entering into history in fullness in Jesus, the climax of God's self-revelation.

Dr. Schreck starts to unfold the riches of the Catholic faith with the opening sections of his Essential Catholic Catechism. The story of God's saving plan of love and redemption of the human race begins with these foundational truths: There is a God. This God reveals himself first in all he has created. And the only suitable human response is faith—believing in God who is real and who cannot deceive, as he is truth and goodness.