The devout soul, even if it practices all the virtues, ascribes everything to God and nothing to itself. God, on the other hand, when He sees its sound and healthy understanding and knowledge, attributes everything to the soul, and rewards it as though it had achieved everything through its own efforts. He does this in spite of the fact that, if He were to bring us to judgment, no true righteousness would be found in us.
For…all belong to God. Man’s body and soul, and even his very being, are his only by grace. What, then, is left to him that he can call his own, by virtue of which he can pride himself or vindicate himself?
~St Makarios of Egypt
Prayerful Life 