He returned to St. Mary of the Angels in the Month of January, 1218, and he determined upon convoking a general chapter, which he proclaimed by circular letters, to be held on Whitsuntide of the year 1219, in order that he might be made acquainted with the state of the missions intrusted to his disciples, and that he might send missionaries into parts where there had hitherto been none. While he was thus occupied by his important projects for the salvation of souls, God, in order to prevent any emotions of pride stealing into his heart, and to maintain in him a profound humility, was pleased to permit that he should be attacked by a violent temptation; it was an extraordinary depression of spirits, which lasted several days. He made every effort to surmount it by his prayers and his tears; and one day when he was praying with more than ordinary fervor, a celestial voice said to him: "Francis, if thou hadst the faith of a grain of mustard-seed, and thou wert to say to this mountain, go thither from hence, it would go." Not understanding the meaning of these words, he asked "what is the mountain"; and he was answered: "The mountain is the temptation." He immediately replied, weeping and humbling himself: "Lord, Thy will be done." And from that moment the temptation ceased, and his mind became perfectly at ease. The year 1218 was divided between the stay he made at St. Mary of the Angels, for the instruction of his brethren, and some excursions he made to Mount Alvernia and to some other places, where new dwellings were made over to him. His route was always marked by the fruits of his preaching, and by the splendor of his miracles. Passing by Montaigu, above the Valley of Caprese, before a Church of St. Paul, which was being repaired, and seeing that two of the masons could not succeed in lifting a stone, which was to be placed as a jamb for the door, his compassion and zeal induced him to lift it and place it as required, which he did alone, and with a strength which was not that of a mortal. The Abbot of the Monastery of St. Justin, in the Diocese of Perugia, met him, and alighted from his horse to compliment him, and to speak to him on some matters of conscience. After a conversation replete with unction, the abbot, recommended himself humbly to his prayers. Francis replied: "I will pray with all my heart;" and they parted. At a little distance from thence, the Saint said to his companion: "Wait a little, brother, I will here perform my promise." He knelt to pray; and while he was so doing, the abbot, who was riding on, felt his mind inflamed with a suavity of devotion, such as he had never before experienced. He stopped, and the vivid impressions with which God favored him, threw him into an ecstasy. But when he came to himself again, he became aware that it was entirely owing to the prayers of Francis.