He passed several years thus, cut off from society; his books were his great resource; he was never without one in his hand. Often he remained in silence from morning till night, wandering among the hills when the sun was yet low; and taking refuge, during the heat of the day, in his shady garden. At night, after performing his clerical duties (for he was canon of Lombes), he rambled among the hills; often entering, at midnight, the cavern, whose gloom, even during the day, struck his soul with awe. "Fool that I was!" he exclaims in after life, "not to have remembered the first school-boy lesson--that solitude is the nurse of love!" While living at Vaucluse, Petrarch, invited to Rome by the Roman Senate, repaired thither to receive the laurel crown of poesy. The ceremony was performed in the Capitol with great solemnity, in presence of all the nobles and high-born ladies of the city. Leaving Rome soon after his coronation, he repaired to Parma, where Clement VI. rewarded him for subsequent political services by naming him prior of Migliarino in the diocese of Pisa. Petrarch returned to Avignon. The sight of Laura gave fresh energy to a passion which had survived the lapse of fifteen years. She was no longer the blooming girl who had first charmed him. The cares of life had dimmed her beauty. She was the mother of many children, and had been afflicted at various times by illness. Her home was not happy. Her husband, without loving or appreciating her, was ill-tempered and jealous. Petrarch acknowledged that if her personal charms had been her sole attraction he had already ceased to love her. But his passion was nourished by sympathy and esteem; and, above all, by that mysterious tyranny of love, which, while it exists, the mind of man seems to have no power of resisting, though in feebler minds it sometimes vanishes like a dream. Petrarch was also changed in personal appearance. His hair was sprinkled with gray, and lines of care and sorrow trenched his face. On both sides the tenderness of affection began to replace, in him the violence of passion, in her the coyness and severity she had found necessary to check his pursuit. The jealousy of her husband opposed obstacles to their seeing each other. They met as they could in public walks and assemblies. Laura sang to him, and a soothing familiarity grew up between them as her fears became allayed, and he looked forward to the time when they might sit together and converse without dread.