Just as the Holy Spirit dwelt in the most holy soul of Christ in order to bring it to God, so He abides in our souls for the same purpose. In Jesus He found a completely docile will, one that He could control perfectly, whereas in us He often meets resistance, the fruit of human weakness; therefore, He desists from the work of our sanctification because He will not do violence to our liberty. He, the Spirit of love, waits for us to cooperate lovingly in His work, yielding our soul to His sanctifying action freely and ardently. In order to become saints, we must concur in the work of the Holy Spirit; but since effective concurrence is impossible without an understanding of the promoter’s actions, it is necessary for us to learn how the divine Paraclete, the promoter of our sanctification, works in us.
We must realize that the Holy Spirit is ever active in our souls, from the earliest stages of the spiritual life and even from its very beginning, although at that time in a more hidden and imperceptible way. However, His very precious action was there, and it consisted especially in the preparing and encouraging of our first attempts to acquire perfection. By giving us grace, without which we could have done nothing to attain sanctity, the Holy Spirit inaugurated His work in us: He elevated us to the supernatural state. Grace comes from God; it is a gift from all three Persons of the Blessed Trinity: a gift created by the Father, merited by the Son in consequence of His Incarnation, Passion, and death, and diffused in our souls by the Holy Spirit. But it is to the latter, to the Spirit of love, that the work of our sanctification is attributed in a very special manner. When we were baptized, we were justified “in the name of the Father and of the Son and of the Holy Spirit”; nevertheless, Sacred Scripture particularly attributes this work of regeneration and divine filiation to the Holy Spirit. Jesus Himself pointed out to us that Baptism is a rebirth “of … the Holy Spirit” (Jn 3:5), and St. Paul stated: “For in one Spirit were we all baptized” and “the Spirit Himself giveth testimony to our spirit, that we are the sons of God” (1 Cor 12:13; Rom 8:16). Therefore, it is the Holy Spirit who has prepared and disposed our souls for the supernatural life by pouring forth grace in us.
– Father Gabriel of St. Mary Magdalen, O.C.D, Divine Intimacy