When the monastery at Montefano was being built, the monks discovered that a massive stone was needed for the altar. As they attempted to move the stone into the church, it suddenly became impossibly heavy. Even with the strength of many men and animals, it could not be moved. The workers realized that an evil spirit was resisting the completion of God's house. Saint Sylvester was immediately called. Filled with calm confidence, he approached the stone and recognized that the obstacle was not natural but spiritual. Making the Sign of the Cross and invoking the holy name of Jesus, he commanded the demon to depart. At once the evil spirit fled, and the stone became light enough to be carried effortlessly by the workers. The altar was completed, and the miracle strengthened the faith of everyone who witnessed it. It reminded the monks that Christ's power is greater than every force of evil and that God's work always triumphs over the powers of darkness.

One day, anxious parents brought their gravely ill child to Saint Sylvester. The child had become so weak that the family feared death was near. Having heard of the saint's holiness, they begged him with tears to intercede before God. Moved by their faith, Sylvester received the child with great compassion. He knelt in prayer, entrusted the child to the mercy of Christ, and made the Sign of the Cross over the little one. Those present watched in silence as the child gradually regained strength and opened his eyes.

The parents rejoiced with profound gratitude, praising God for the miracle. Saint Sylvester accepted no praise for himself, reminding everyone that God alone is the source of healing and life.

Among those who came to Montefano was a man who had been blind from birth. Having lived his entire life in darkness, he longed not only for physical sight but also for hope. Trusting completely in God's servant, he humbly asked Saint Sylvester for his prayers. Sylvester compassionately prayed over him, invoking the power of Christ, who had given sight to the blind in the Gospel. After making the Sign of the Cross, the man's eyes were opened, and for the first time he saw the light of day. His joy was beyond words as he beheld the faces of those around him.

The miracle quickly became known throughout the surrounding villages. It strengthened the faith of many people and reminded them that Christ continues to work through holy servants who trust completely in His power.

During the construction of one of the monastery buildings, the builders discovered that an important wooden beam had been cut too short. Without a longer beam, the work could not continue, and obtaining another piece of timber would have caused great delay. The workers turned to Saint Sylvester for help. Instead of becoming anxious, he prayed confidently, asking God to provide what human effort could not accomplish. By divine intervention, the beam miraculously lengthened until it fit perfectly into its place. Everyone present recognized that they had witnessed an extraordinary act of God's providence. The miracle encouraged the monks to trust that God faithfully provides for those who dedicate themselves entirely to His service.

A woman who had long suffered under the torment of an evil spirit was brought before Saint Sylvester. Her violent behavior and terrible suffering had left her family without hope. Believing firmly in the saint's holiness, they begged him to pray for her deliverance. Saint Sylvester approached her without fear, relying entirely on the authority of Christ. He prayed fervently, made the Sign of the Cross, and commanded the evil spirit to depart in the name of Jesus Christ. The demon immediately left her, and the woman was restored to peace and soundness of mind. Those who witnessed the event glorified God, realizing that Christ's victory over evil remained alive in His Church. The miracle testified not to Sylvester's personal power but to his complete faith in the Lord.

A devastating fire once broke out in the town of Fabriano, threatening homes, businesses, and the lives of many people. Strong winds carried the flames rapidly from one building to another, leaving the townspeople helpless before the destruction. The frightened citizens sought the prayers of Saint Sylvester. Filled with confidence in God, he raised his hands in prayer and implored the Lord to protect the town. Almost immediately the flames lost their strength and were brought under control, sparing the greater part of the city.

The people praised God for their deliverance and recognized His protection through the prayers of His faithful servant. The miracle deepened the devotion of the people toward Saint Sylvester and strengthened their trust in divine providence.

On one occasion, the monastery faced an unexpected shortage of wine needed for the community. The monks trusted Saint Sylvester, knowing that he always placed every difficulty before God in prayer. With complete confidence in divine providence, Sylvester blessed the available water and prayed that God would provide for His servants. To the amazement of those present, the water was miraculously transformed into good wine. The monks gave thanks to God, recognizing the miracle as a sign of His generous care. The event recalled Christ's first miracle at the wedding feast of Cana. Through this extraordinary sign, Saint Sylvester taught his community that God never abandons those who seek His kingdom with sincere faith and humble hearts.