The great apostle of the Marian devotion, Saint Louis Grignion de Montfort, in his celebrated book “A Treatise on the True Devotion to the Blessed Virgin”, synthesizes in an admirable manner, the unique role of Mary in the fight against Satan:
“Mary must be terrible to the devil and his crew, as an army in battle array, principally in these latter times, because the devil, knowing that he has but little time, and now less than ever, to destroy souls, will every day redouble his efforts and his combats.”
“He will presently raise up new persecutions, and will put terrible snares before the faithful servants and true children of Mary, whom it gives him more trouble to surmount than it does to conquer others.”
“It is principally of these last and cruel persecutions of the devil, which shall go on increasing daily till the reign of Antichrist, that we ought to understand that first and celebrated prediction and curse of God, pronounced in the terrestrial Paradise against the serpent. It is to our purpose to explain this here, for the glory of the most holy Virgin, for the salvation of her children, and for the confusion of the devil.”
“I will put enmities between thee and the woman, and thy seed and her seed; she shall crush thy head, and thou shalt lie in wait for her heel” (Gn 3, 15).
“God has never made or formed but one enmity; but it is an irreconcilable one, which shall endure and develop even to the end. It is between Mary, His worthy Mother, and the devil - between the children and the servants of the Blessed Virgin and the children and instruments of Lucifer. The most terrible of the enemies which God has set up against the devil is His Holy Mother, Mary.”