30 You can easily see, therefore, how important it is for the Christian people to turn to the example of holiness given by St. Francis, so that they may be edified thereby and may make his teachings the rule of their own lives. It would be impossible to exaggerate the value of his books and pamphlets, of which We have written, to attain this purpose. These books ought to be distributed as widely as possible among Catholics, for his writings are easy to understand and can be read with great pleasure. They cannot but inspire in the souls of the faithful a love of true and solid piety, a love which the clergy can develop with most happy results if they but learn to assimilate thoroughly the teachings of St. Francis and to imitate the kindly qualities which characterized his preaching.
Source: Rerum Omnium Perturbationem (Vatican.va)