Luke 1:41

(vid. etiam Tit. Bos.) He was not filled with the Spirit, until she stood near him who bore Christ in her womb. Then indeed he was both filled with the Spirit, and leaping imparted the grace to his mother; as it follows, And Elisabeth was filled with the Holy Spirit. But we cannot doubt that she who was then filled with the Holy Spirit, was filled because of her son.

But soon the blessed fruits of Mary's coming and our Lord's presence are made evident. For it follows, And it came to pass, that when Elisabeth heard the salutation of Mary, the babe leaped in her womb. Mark the distinction and propriety of each word. Elisabeth first heard the word, but John first experienced the grace. She heard by the order of nature, he leaped by reason of the mystery. She perceived the coming of Mary, he the coming of the Lord.

(Epist. ad Dardanum 57.) But in order to say this, as the Evangelist has premised, she was filled with the Holy Spirit, by whose revelation undoubtedly she knew what that leaping of the child meant; lamely, that the mother of Him had come unto her, whose forerunner and herald that child was to be. Such then night be the meaning of so great an event; to be known indeed by grown up persons, but not understood by a little child; for she said not, "The babe leaped in faith in my womb," but leaped for joy. Now we see not only children leaping for joy, but even the cattle; not surely from any faith or religious feeling, or any rational knowledge. But this joy was strange and unwonted, for it was in the womb; and at the coming of her who was to bring forth the Saviour of the world. This joy, therefore, and as it were reciprocal salutation to the mother of the Lord, was caused (as miracles are) by Divine influences in the child, not in any human way by him. For even supposing the exercise of reason and the will had been so far advanced in that child, as that he should be able in the bowels of his mother to know, believe, and assent; yet surely that must be placed among the miracles of Divine power, not referred to human examples.

Nor is it to be wondered at, that our Lord, about to redeem the world, commenced His mighty works with His mother, that she, through whom the salvation of all men was prepared, should herself be the first to reap the fruit of salvation from her pledge.

(Geometer.) For the Prophet sees and hears more acutely than his mother, and salutes the chief of Prophets; but as he could not do this in words, he leaps in the womb, which was the greatest token of his joy. Who ever heard of leaping at a time previous to birth? Grace introduced things to which nature was a stranger. Shut up in the womb, the soldier acknowledged his Lord and King soon to be born, the womb's covering being no obstacle to the mystical sight.