Since God remained silent and did not foretell to her anything that was going to happen, He clearly showed that He did not know anything more beautiful or greater than that which He perceived in the Virgin;
from this fact it is evident that He did not choose for His Mother the best of all those in existence, but her who was absolutely the best;
nor did He choose her who was more suitable for Him than anyone else in the human race, but her who so totally suited Him, that it was fitting that she become His Mother.
Indeed, it was absolutely necessary for human nature at some time to make itself fit for the task for which it was created at the beginning, that is, to bring forth someone capable of worthily serving the purpose of the Creator.
For God did not create humanity with one purpose in mind, only to decide later on to use it for a different purpose, in the way that we take tools designed for one pursuit and misuse them for another, so that there is no need for them always to be congruent with their original function.
Rather, He created mankind with this end in view, that, when He needed to be born, He might take from it a Mother.
Having first established this need as a kind of standard, He then fashioned man in accordance with it.
For, neither should we posit any other end for the creation of man than that which is the most excellent of all and which brings the greatest honor and glory to the Artificer, nor is it conceivable that God should in any way fail in creating the things that He creates.
[…] What, therefore, was there to prevent human nature from being in conformity, and in every way in agreement and harmony, with the purpose for which it was created?
For it is God Who governs His Œconomy, and this Œconomy is the greatest work of God and par excellence the work of His hands; and He did not entrust the matter to the ministry of any human being or Angel, but reserved it for Himself.
Therefore, whom, if not God, does it behoove, when producing anything whatsoever, to observe the requisite standards? And in the case of what else than the most beautiful of His works? On what else, of all things, if not on Himself, would God confer what is appropriate?
After all, Paul required that a Bishop “rule well himself and his own house” before caring for the common good.
Nicholas Cabasilas (1319/1323–after 1391): On the Occasion of the Feast of the Annunciation, 8, Translated from the Greek text in “Homélies Mariales Byzantines (II),” ed. M. Jugie, in Patrologia Orientalis, Vol. XIX, pp. 484-495 @ Old Calendar Orthodox Church of Greece.