10 The meekness of St. Francis was therefore an effect of his tremendous will power, constantly strengthened by his lively faith and the fires of divine love which burned within him. Certainly, to him We can apply the words of Holy Scripture, "Out of the strong came forth sweetness." ( Judges xiv, 14) Is it any wonder, then that this "pastoral kindliness" which he possessed and which, according to St. John Chrysostom "is more violent than virtue" (Homily 58 on Genesis ) possessed the power to attract hearts in that very measure of success which Christ Himself has promised to the meek - "Blessed are the meek: for they shall possess the land." ( Matt . v, 4)
Source: Rerum Omnium Perturbationem (Vatican.va)