Before I formed thee in the bowels of thy mother, I knew thee: and before thou camest forth out of the womb, I sanctified thee...Jeremiah 1:5

St. Joseph was a miracle of holiness and the Lord infused into his soul the most perfect habits of all the virtues and gifts. Joseph was sanctified in his mother’s womb seven months after his conception, and the leaven of sin was destroyed in him for the whole course of his life. – Venerable Maria de Agreda

St. Joseph had three privileges which were special to him. Firstly, that he was sanctified in his mother's womb. Secondly, that he was at the same time confirmed in grace. And thirdly, that he was always exempt from the inclinations of concupiscence.  – St. Alphonsus Liguori

The Virgin was betrothed to a man named Joseph, of the House of David. – St. Luke 1:27

How exalted in this virtue of virginity must Joseph have been who was destined by the Eternal Father to be the companion in virginity of Mary! Both had made a vow to preserve virginity for their entire lives, and it was the Will of God to join them in the bond of a holy marriage… St. Francis de Sales

The Most High God inspired the High Priest to place into the hands of each of the young men a dry stick, with the command that they ask the Lord to single out the one whom He had chosen as the spouse of Mary. While they prayed, the staff which Joseph held was seen to blossom and at the same time a dove of purest white and resplendent with admirable light, was seen to descend upon the saint... And the priest espoused Mary to the most chaste and holy of men, Saint Joseph. – Venerable Maria de Agreda

The Espousals between Joseph and Mary are an episode of great importance. Joseph was of the royal line of David and, in virtue of his marriage to Mary, would confer on the Son of the Virgin - on God's Son - the legal tile of "Son of David," thus fulfilling the prophecies. The espousals of Joseph and Mary are determinant in the history of humanity's salvation, in the realization of the promises of God; because of this, it has a supernatural connotation, which Joseph and Mary accept with humility and trust. – Pope Benedict XVI 

God speaks ... by a dream in a vision by night, when deep sleep falls upon men, and they are sleeping in their beds:  Then he opens the ears of men, and instructs them in what they are to learn.Job 33:14-16

St. Joseph is presented as a “just man” (Matthew 1:19), faithful to God’s law, ready to do His will. On account of this he enters into the mystery of the Incarnation after an angel of the Lord appears to him in a dream and tells him: "Joseph, son of David, do not be afraid to take Mary your wife with you. In fact the child that has been conceived in her comes from the Holy Spirit; she will give birth to a son and you will call him Jesus: he in fact will save his people from their sins" (Matthew 1:20-21). Forgetting the thought of repudiating Mary in secret, he takes her in because his eyes now see the work of God in her.  -  Pope Benedict XVI

And Joseph also went up from Galilee, out of the city of Nazareth into Judea, to the city of David, which is called Bethlehem: because he was of the house and family of David, to be enrolled with Mary his espoused wife, who was with child. And it came to pass, that when they were there, her days were accomplished, that she should be delivered. And she brought forth her firstborn son, and wrapped him up in swaddling clothes…  – St. Luke 2:4-7

St. Joseph adored the newborn in profoundest humility and with tears of joy he kissed his feet in admiration…  Venerable Maria de Agreda

On that holy night, in Bethlehem, with Mary and the Child, is Joseph, to whom the Heavenly Father entrusted the daily care of his Son on earth, a care carried out with humility and in silence.– Pope Benedict XVI

The Church admires the simplicity and the depth of St. Joseph’s faith. She admires and venerates his rectitude, his humility, his courage. How many values God entrusted to Joseph in his humble and hidden life as an artisan of Nazareth! He entrusted to him his own eternal Son, who in the house of Joseph embraced all that constitutes the truth of the Son of man. To Joseph God entrusted Mary, her virginity and her maternity – her virginal maternity. He entrusted to him the Holy Family. God entrusted to Joseph what is most holy in the whole history of creation, and that humble man, that carpenter, did not disappoint God’s trust. To the very end he showed himself faithful, thoughtful, provident, solicitous – after the model of the eternal Father Himself.Pope St. John Paul II

I wish to extend a particular word of encouragement to fathers so that they may take Saint Joseph as their model. He who kept watch over the Son of Man is able to teach them the deepest meaning of their own fatherhood. In the same way, each father receives his children from God, and they are created in God’s own image and likeness. Saint Joseph was the spouse of Mary. In the same way, each father sees himself entrusted with the mystery of womanhood through his own wife. Dear fathers, like Saint Joseph, respect and love your spouse; and by your love and your wise presence, lead your children to God where they must be.  – Pope Benedict XVI