St. Gregory Palamas on Mary as Universal Mediatrix

It is an eternal law in heaven that the lesser shall share by means of the greater in what lies beyond being. So as the Virgin Mother is incomparably greater than all, and as many as will share in God will do so through her, and as many as will know God will acknowledge her as the one who contained Him Who Cannot be contained, and as many as will extol God will hymn her too after Him. She is the reason for everything which preceded her, the protectress of everything which came after, and the cause of eternal blessings. She is the theme of the prophets, the starting-point of the Apostles, the support of the martyrs, the foundation of teachers. She is the glory of those on earth, the delight of those in heaven, the adornment of the whole Creation. She is the beginning, source and root of good things past telling, the summit and fulfillment of everything holy.

O holy Virgin, how can I put everything about you into words? How can I express my desire? How can I glorify you, the treasure of glory? Just remembering you brings hallowing. A mere glance in your direction enlightens the mind, raising it instantly to divine heights. In you the eyes of our understanding become clear. In you our spirit is radiant with the presence of the divine Spirit. For you did not become the keeper and store of graces so as to have them for yourself, but to fill the universe with grace. For the person in charge of inexhaustible treasures oversees their distribution. Why would you shut away your wealth as it never diminishes? Share it abundantly with us, O Lady, and if we cannot contain it, enlarge our capacity, and then lavish it upon us. For you alone did not receive by measure, as all things were given into your hand.

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Source: St. Gregory Palamas, Sermon on the Blessed Virgin (?).