But Calasanz's main concern was undoubtedly the moral and Christian education of his students. As both priest and educator, he considered education to be the best way of changing society. All his writing is imbued with his Christian ideals, and the constitutions and regulations of the Pious Schools were based on the same spirit. Calasanz created an ideal image of a Christian teacher and used it to train the teachers who worked with him.

Calasanz wrote a version of the prayer "The Crown of Twelve Stars," and he established continuous prayer