Late Orthodoxy was torn by influences from rationalism, philosophy based on reason, and Pietism, a revival movement in Lutheranism that sought to emphasise the importance of personal devotion, morality, emotions, and the study of Scripture. After a century of vitality, the Pietist theologians Philipp Jakob Spener and August Hermann Francke warned that Lutheran orthodoxy degenerated life-changing scriptural truth into meaningless intellectualism and Formalism. Pietism increased at the expense of orthodoxy, but their emphasis on personal morality and sanctification came at the expense of teaching the doctrine of justification. The Pietisitic focus on stirring up devout emotions was susceptible to the arguments of rationalist philosophy.