169 Among the saints in heaven the Virgin Mary Mother of God is venerated in a special way. Because of the mission she received from God, her life is most closely linked with the mysteries of Jesus Christ, and there is no one who has followed in the footsteps of the Incarnate Word more closely and with more merit than she: and no one has more grace and power over the most Sacred Heart of the Son of God and through Him with the Heavenly Father. Holier than the Cherubim and Seraphim, she enjoys unquestionably greater glory than all the other saints, for she is "full of grace," she is the Mother of God, who happily gave birth to the Redeemer for us. Since she is therefore, "Mother of mercy, our life, our sweetness and our hope," let us all cry to her "mourning and weeping in this vale of tears," and confidently place ourselves and all we have under her patronage. She became our Mother also when the divine Redeemer offered the sacrifice of Himself; and hence by this title also, we are her children. She teaches us all the virtues; she gives us her Son and with Him all the help we need, for God "wished us to have everything through Mary."
Source: Mediator Dei (Vatican.va)