A prayer to the Most Holy Theotokos, by St Peter of Damascus

Blessed Queen of the universe,
thou knowest that we sinners have no intimacy with God whom thou hast borne.
But, putting our trust in thee,
through thy mediation we thy servants prostrate ourselves before the Lord:
for thou canst freely approach Him since He is thy son and our God.
Thus I, too, unworthy believer that I am, entreat thee, holy Queen,
that I may be allowed to perceive the gifts of grace bestowed on thee
and on the other saints,
and to understand how thou dost display so many virtues.
Simply thy giving birth to the Son of God shows that thou excellest all other beings.
For He Who, as creator of all,
knows all things before they come into existence,
found thy womb worthy of His indwelling.

From St. Peter of Damascus (Book 1 : A Treasury of Divine Knowledge, The Philokalia Vol. 3 edited by Palmer, Sherrard and Ware; Faber and Faber pgs. 129-130)