Matthew 15:28 - Coke's Commentary on the Holy Bible

Then Jesus answered—O woman! great is thy faith— Jesus having thus made it evident that the woman possessed a very high degree of faith, a just notion of his power and goodness, and of her own unworthiness, wrought with pleasure the cure which she solicited on behalf of her daughter, and atthe same time gave her faith the praise which was due to it. As soon as she had uttered the sentiment which was so acceptable to Christ, he willed the ejection of the demon; and though scarce any time passed between her uttering that sentiment and his answer, so great was his power and goodness, that the devil was expelled before he spake, Go thy way, the devil is gone out of thy daughter, Mark 7:29. The success which this Canaanitish woman's suit met with from Jesus, teaches us two lessons of great importance: 1st, That God is no respecter of persons, but always accepts sincere faith and fervent prayer, proceeding from a humble penitent heart. 2ndly, That it is our duty to continue in prayer with earnestness, although the answer thereof should be long deferred. But see more in the Inferences and Reflections.