The grace of deification is, therefore, above nature, virtue and knowledge and, according to St Maximos, all such things infinitely fall short of it. For all the virtue we can attain and such imitation of God as lies in our power does no more than fit us for union with the Deity, but it is through grace that this ineffable union is actually accomplished. Through grace God in His entirety penetrates the saints in their entirety, and the saints in their entirety penetrate God entirely, exchanging the whole of Him for themselves, and acquiring Him alone as the reward of their ascent towards Him; for He embraces them as the soul embraces the body, enabling them to be in Him as His own members.
~St Gregory Palamas (Philokalia vol.4, p.421)
Prayerful Life 