Then touched he their eyes, saying,
According to your faith be it unto you.
All Commentaries on Matthew 9:29 Go To Matthew 9
And then at last He for His part lays His hand upon them, saying, According to your faith be it unto you. And this He does to confirm their faith, and to show that they are participators in the good work, and to witness that their words were not words of flattery. For neither did He say, Let your eyes be opened, but, According to your faith be it unto you; which He says to many of them that came unto Him; before the healing of their bodies, hastening to proclaim the faith in their soul; so as both to make them more approved, and to render others more serious.
Thus with respect to the sick of the palsy also; for there too before giving nerve to the body, He raises up the fallen soul, saying, Son, be of good cheer, your sins be forgiven you. And the young damsel too, when He had raised her up, He detained, and by the food taught her her Benefactor; and in the case of the centurion also He did in like manner, leaving the whole to his faith; and as to His disciples again, when delivering them from the storm on the sea, He delivered them first from their want of faith. Just so likewise in this case: He knew indeed, even before their cry, the secrets of their mind; but that He might lead on others also to the same earnestness, He makes them known to the rest as well, by the result of their cure proclaiming their hidden faith.