Miracles: A Preliminary Study is a profound exploration by C.S. Lewis into the realm of supernatural events. In this text, Lewis challenges the rationalists, agnostics, and deists on their own grounds, presenting a compelling argument for the existence of divine intervention.

Lewis argues that a Christian must not only accept but also rejoice in miracles as a testimony of the personal involvement of God in his creation. He employs his characteristic lucidity and wit to develop his argument, providing readers with a poetic and joyous affirmation that miracles do indeed occur in our everyday lives.

The central miracle asserted by Christians, according to Lewis, is the Incarnation. He states, "They say that God became Man. Every other miracle prepares the way for this, or results from this." This key statement forms the backbone of his discourse, offering a unique philosophical inquiry into the nature of miracles.