He was consumed with the flame of divine love, and had a special feeling of devotion to the Passion of Christ the Lord, which was the subject of constant meditation to him; and to the Virgin Mother of God, to whose service he vowed himself; and this devotion he strove also to arouse in others both by word and example, and he laboured to spread it by his writings and treatises. And so came that sweetness of manner, grace of speech, and the charity which he extended to all, by which he completely and utterly conquered every soul. Wherefore, when only thirty-five years of age he was elected, at Rome, by unanimous consent, Minister General of the Order; and having accepted the office, he fulfilled it for eighteen years with admirable prudence and the recognition of his sanctity. He made many rules, useful for regular discipline and the increase of the order; which, together with the other mendicant orders, he defended successfully against the calumnies of their enemies.
He was summoned to the Council of Lyons by blessed Gregory X, and having been created Cardinal Bishop of Albano, he diligently performed a noted work for the council in very difficult circumstances; in which the dissensions of the schism were composed, and the dogmas of the Church vindicated. In the midst of these labours he died, to the great grief of all, in the fifty-third year of his age, and in the year of salvation 1274, and his funeral was honoured by the whole council and by the presence of the Roman Pontiff himself. Sixtus IV, after Bonaventure had become illustrious for many and great miracles, placed him in the list of the Saints. He wrote many books, in which the highest erudition and the fire of piety are so united as both to touch and instruct the reader. Sixtus V on this account worthily distinguished him by the name of the Seraphic Doctor.