Who is the Holy Spirit? The flowering of the love of the Father and the Son. If the fruit of created love is a created conception, then the fruit of divine Love, that prototype of all created love, is necessarily a divine “conception.” The Holy Spirit is, therefore, the “uncreated, eternal conception,” the prototype of all the conceptions that multiply life throughout the whole universe.
The Father begets; the Son is begotten; the Spirit is the “conception” that springs from their love. There we have the intimate life of the three Persons by which they can be distinguished one from another. But they are united in the oneness of their Nature, of their divine existence.
The Spirit is, then this thrice holy “conception,” this infinitely holy, Immaculate Conception…
The creature most completely filled with this love, filled with God himself, was the Immaculata, who never contracted the slightest stain of sin, who never departed in the least from God’s will. United to the Holy Spirit as his spouse, she is one with God in an incomparably more perfect way than can be predicated of any other creature.
Saint Maximilian Kolbe (reflections written on February 17, 1941)