This short series, which aims to show us the importance of the conversion of the heart, must also be understood in a supra‑personal dimension. This means that our efforts to attain a pure heart not only serve our personal sanctification, but are also a weapon in spiritual combat. St. Paul makes it clear that our struggle is against “the principalities, against the powers (…), against the spiritual hosts of wickedness in the heavenly places.” (Eph 6:12) They take advantage of our evil human inclinations and reinforce them. Once our hearts have been darkened, it becomes easier for them to involve us in their rebellion against God or, at least, to weaken or incapacitate us for the true fight against these spirits.
On the other hand, a heart that—thanks to the influence of the Holy Spirit—becomes increasingly pure and in which God’s grace flows is unbearable to them. Just think of the most pure Heart of the Virgin Mary, from whom they must flee. In addition, such a heart becomes increasingly inflamed with love for God and for human beings, and places itself completely at the service of the heavenly Father. Therefore, it will fight against anything that seeks to tarnish the glory of God and will carry the message of the Gospel to others. This, in turn, weakens the power of the Evil One, so that every pure heart becomes a threat to him—not only because it does not allow itself to be led astray by his machinations, but because it actively combats them with the power of the Lord. Thus, we can take our place in the army of the Lamb, cooperating through our prayer and our struggle for holiness so that the peace of Christ may come to humanity and the power of His love may drive away the darkness.