This is the radical purification
God demands of Joseph’s heart.
His love for Mary
Must be offered to the Father
Only to be fulfilled in accordance with God’s will.

Surely this is what God demands of every human love: that it be supernaturalized through charity, and radically so. However, in Joseph’s case, that which ordinarily is radical and fundamental becomes explicit and present “in act.”In order for him to espouse Mary in truth, he has to live in his heart what she herself lives in relation to her God: the offering of one’s entire life in total surrender.  –Father Marie-Dominique Philippe ‘The Mystery of St Joseph’