S Gregory Palamas preached this sermon on August 15, hence the now in the next sentence. The Hesychast tradition which he skilfully expounded emphasised the truth, reality and possibility of human participation in the Divine Nature; accordingly, it was easy for him to see our Lady as the supreme triumph of divinisation.
O Virgin, divine and now heavenly, how shall I tell the whole of thee? How shall I glorify thee, who art the treasury of Glory? It is alone thy memorial which sanctifies the one who uses it. Attention to thee (neusis pros se) is the only thing which makes the mind clearer, raising it immediately to a divine height; through thee the eye of contemplation is made more acute; through thee is illumined the spirit by the indwelling of the divine Spirit; for thou didst become steward (tamiouchos) and full content (perioche) of graces; not so that thou mightest keep them by thyself, but so that thou might fill the whole of everything (ta sumpanta) with grace - because the Dispenser of inexhaustible treasures ordains (epitropeuei) it on account of the distribution: for why would he make the undiminshed wealth to be closed up?
One more paragraph..