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The great Dominican theologian Rev. Fr. Garrigou-Lagrange answers this question in his great work The Mother of The Savior and Our Interior Life, Pt. II, ch. vii "The Predestination of St. Joseph and His Eminent Sanctity," (trans. Rev. Father Bernard J. Kelley; Dublin: Golden Eagle Books, Ltd., 1948).
Servants of Jesus and Mary, have great confidence and cherish immensely this humble carpenter of Nazareth, for he has been given great power by Jesus and Mary to do all that is possible for his devout client: and he shall give you the greatest treasure imaginable --- a greater love for Jesus and Mary.
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