6 Whoever attentively reviews the life of St. Francis will discover that, from his earliest years, he was a model of sanctity. He was not a gloomy, austere saint but was most amiable and friendly with all, so much so that it can be said of him most truthfully, "her conversation (wisdom) hath no bitterness, nor her company any tediousness, but joy and gladness." ( Wisdom , viii, 16) Endowed with every virtue, he excelled in meekness of heart, a virtue so peculiar to himself that it might be considered his most characteristic trait. His meekness, however, differed altogether from that artificial gentility which consists in the mere possession of polished manners and in the display of a purely conventional affability. It differed, too, both from the apathy which cannot be moved by any force and from the timidity which does not dare to become indignant, even when indignation is required of one. This virtue, which grew in the heart of St. Francis as a delightful effect of his love of God and was nourished by the spirit of compassion and tenderness, so tempered with sweetness the natural gravity of his demeanor and softened both his voice and manners that he won the affectionate regard of everyone whom he encountered.
Source: Rerum Omnium Perturbationem (Vatican.va)