For Bernard Lonergan and Karl Rahner, grace is a reality that can be not only professed in worship or inferred through metaphysical analysis but also experienced in the depths of consciousness. Here the author uses a Lonerganian hermeneutic to study the evolution of the theology of grace from the writings of Augustine through the Scholastic work of Aquinas to the theology of Lonergan. His analysis demonstrates that the transition to an account that expresses grace in terms of human experience represents a development in the Catholic theology of grace.