United to the Holy Spirit as his Spouse, the Immaculata is one with God in an incomparably more perfect way than can be predicated of any other creature. What sort of union is this? It is above all an interior union, a union of her essence with the "essence" of the Holy Spirit. The Holy Spirit dwells in her, lives in her. This was true from the fist instant of her existence. It was always true, it will always be true. In what does this life of the Spirit in Mary consist? He himself is uncreated Love in her; the Love of the Father and of the Son, the Love by which God loves Himself, the very love of the Most Holy Trinity. He is a fruitful love, a "Conception". Among creatures made in God's image the union brought about by married love is the most intimate of all (cf. Mt 19:6). In a much more precise, more interior, more essential manner, the Holy Spirit lives in the soul of the Immaculata, in the depths of her very being. He makes her fruitful, from the very first instant of her existence, all during her life, and for all eternity.
St. Maximilian Kolbe, "Sketches for a book", 17 February 1941.