This is an extract from an Advent meditation taken from “Prayers and Devotions” by Pope John Paul II and edited by Bishop Peter Canisius Johannes van Lierde:
Saint Joseph of Nazareth was a “just man.” It was said to his credit, “as justice,” that he believed in “the God who gives life to the dead and calls into existence things which do not yet exist.”
That happened at the decisive moment for the history of salvation, when God, the eternal Father, “sent His Son into the world” to accomplish the promise made to Abraham.
It was exactly then that the faith of Joseph of Nazareth was manifested. It showed itself to be up to the measure of the faith of Abraham.
It was manifested even more when “the Word of the Living God became flesh in Mary,” the Spouse of Joseph; by the announcement of the angel, “she was with child through the power of the Holy Spirit.” The faith of St. Joseph was bound to be manifested “before the mystery of the Incarnation of the Son of God.”
Then it was indeed that Joseph of Nazareth underwent the great proof of his faith, just as Abraham had seen his faith tried. And now Joseph, “the just man,” believed in Him who “calls into existence things which do not yet exist.”
In fact, God Himself, through the power of the Holy Spirit, called into existence the humanity which was that proper to the only begotten Son of God, the Father’s Eternal Word, in the womb of the Virgin of Nazareth, Mary, the bride promised to Joseph.
And Joseph of Nazareth believed in God: “Joseph, Son of David, have no fear about taking Mary as your wife. It is by the Holy Spirit that she has conceived this child.” Joseph took Mary to himself- and That which had been engendered in her.