On Grace:

St. John Chrysostom says: "A man's readiness and commitment are not enough if he does not enjoy help from above as well; equally help from above is no benefit to us unless there is also commitment and readiness on our part. These two facts are proved by Judas and Peter. For although Judas enjoyed much help, it was of no benefit to him, since he had no desire for it and contributed nothing from himself. But Peter, although willing and ready, fell because he enjoyed no help from above. So holiness is woven of these two strands. Thus I entreat you neither to entrust everything to God and then fall asleep, nor to think, when you are striving diligently, that you will achieve everything by your own efforts."

St. Theodoros, the Great Ascetic , Philokalia (Vol. 2)