Doctrine and Devotion by Adolphe Tanquerey is a work of Catholic theology and spirituality that connects fundamental Catholic dogmas with practical Christian living and spiritual growth. It functions as a synthesis of doctrine and morals, showing how belief should inform and inspire devotion. The central premise of the book is that core Catholic doctrines, when properly understood, are the foundation and source of piety and devotion. Tanquerey bridges the gap between abstract theological concepts (doctrine) and the practical application of faith in daily life (devotion). The work is an adaptation and translation of some of his French writings, specifically focusing on the dogmas which generate piety and the divinization of suffering.