Chrysostom (349-407): But thou art unworthy. Become worthy by thy assiduity. For that it both is possible that the unworthy should become worthy from his assiduity; and that God assents more when called on by ourselves than by others; and that he often delays the giving, not from the wish that we should be utterly perplexed, nor to send us out with empty hands; but in order that he may become the author of greater good things to us–these three points I will endeavor to make evident by the parable which has to-day been read to you. The woman of Canaan had come to Christ praying on behalf of a daughter possessed by a demon, and crying out with much earnestness (it says, “Have pity on me, Lord, my daughter is badly possessed by a demon.”) See, the woman of a strange nation, and a barbarian, and outside of the Jewish commonwealth. For indeed what else (was she) than a dog, and unworthy of the receiving her request? For “it is not,” he says, “good to take the children’s bread, and to give it to the dogs.” But, all the same, from her assiduity, she became worthy. For not only did he admit her into the nobility of children, dog as she was; but also he sent her off with that high encomium saying, “O woman great is thy faith; be it done to thee as thou wilt.” Now when the Christ says, “great is thy faith,” seek thou no other demonstration of the greatness of soul which was in the woman. Seest thou how, from her assiduity the woman, being unworthy, became worthy? Desirest thou also to learn that we accomplish (our wish) by calling on him by ourselves more than by others?
NPNF1: Vol. IX, Concerning Lowliness of Mind and Commentary on Philippians 1:18, Homily 3, §12.