A Donor Presented to the Virgin
"So great is the authority that mothers possess over their sons, that even if they are monarchs, and have absolute dominion over every person in their kingdom, yet never can mothers become the subjects of their sons. It is true that Jesus now in Heaven sits at the right of the Father, enjoying that distinction even as Man because of the hypostatic union with the Person of the Divine Word.
He has supreme dominion over all and also over Mary; nevertheless, it can always be said that for a time at least, when He was living in this world, He was pleased to humble himself and be subject to Mary. Says St. Ambrose, Jesus Christ having deigned to make Mary His Mother, inasmuch as He was her Son, He was truly obliged to obey her. And for this reason, says Richard of St. Laurence, "Of other Saints we say that they are with God; but of Mary alone can it be said that she was so far favored as to be not only herself submissive to the will of God, but even that God was subject to her will.
Therefore we say that, even though Mary can no longer command her Son, since they are not on earth any more, still her prayers are always the prayers of a Mother and are therefore most powerful in obtaining whatever she asks.
At the command of Mary all obey, even God.
She is omnipotent, for the queen, according to all laws, enjoys the same privileges as the king; and since the son's power also belongs to the mother, this Mother is made omnipotent by an omnipotent Son." --The Glories of Mary, translated from the Italian of St. Alphonsus de Liguori