This article explores the character of the ‘pious studies’ Katherine promoted: both through her own work, as translator and author; and through sponsoring translations by members of her household. It traces Katherine's movement from a traditional spirituality — associated with the girlish verses addressed to her uncle William Parr that she inscribed in her father's Latin primer — through a transitional phase to her self-signalled positioning as a reformer. In its devotional orientation, Katherine's work shows affinities to the spiritual and intellectual outlook of John Fisher, whose blend of scripturalism, Scholasticism, and humanism found expression in a theology — balanced between reform and traditionalism — centred on Christ's passion, repentance, and the dynamics of salvation.