3 And who could think or say that the confidence so strongly felt in thepatronage and protection of the Blessed Virgin is excessive? Undoubtedly thename and attributes of the absolute Mediator belong to no other than to Christ,for being one person, and yet both man and God, He restored the human race tothe favour of the Heavenly Father: One Mediator of God and men, the man ChristJesus, who gave Himself a redemption for all (1 Tim. ii. 5, 6). And yet, as theAngelic Doctor teaches, there is no reason why certain others should not becalled in a certain way mediators between God and man, that is to say, in so faras they co-operate by predisposing and ministering in the union of man with God (Summa, p. III, q. xxvi., articles 1, 2). Such are the angels and saints, theprophets and priests of both Testaments; but especially has the Blessed Virgin aclaim to the glory of this title. For no single individual can even be imaginedwho has ever contributed or ever will contribute so much towards reconciling manwith God. She offered to mankind, hastening to eternal ruin, a Saviour, at that moment when she received the announcement of the mystery of peace brought to this earth by the Angel, with that admirable act of consent in the name of the whole human race (Summa. p. III, q. xxx., art. 1). She it is from whom is born Jesus ; she is therefore truly His mother, and for this reason a worthy and acceptable "Mediatrix to the Mediator." As the various mysteries present themselves one after the other in the formula of the Rosary for the meditation and contemplation of men's minds, they also elucidate what we owe to Mary for our reconciliation and salvation. No one can fail to be sweetly affected when considering her who appeared in the house of Elizabeth as the minister of the divine gifts, and who presented her Son to the Shepherds, to the kings, and to Simeon. Moreover, one must remember that the Blood of Christ shed for our sake and those members in which He offers to His Father the wounds He received, the price of our liberty , are no other than the flesh and blood of the virgin, since the flesh of Jesus is the flesh of Mary, and however much it was exalted in the glory of His resurrection, nevertheless the nature of His flesh derived from Mary remained and still remains the same ( de Assumpt. B. V. M., c.v. , among the Opera S. Aug ).
Source: Fidentem Piumque Animum (Vatican.va)