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God needs people who are persistent in prayer like the Canaanite woman who refused to be put off. He is waiting for people who, even on first receiving a stone instead of bread, nevertheless persevere and take God at His word. Jesus once asked, ‘What man of you, if his son asks him for bread, will give him a stone?’ No true father would! So say to your heavenly Father, ‘You will never give me a stone when I ask for something!’ In response to such a humble prayer God will turn the stone — even were it already in your hands — into bread. He stands by His word.
Matthew 15:21-28; 7:9 RSV
from: http://www.kanaan.org/international/daily_readings/july.htm