Jamieson, Fausset and Brown on Matthew 9:28

28. And when he was come into the house--To try their faith and patience, He seems to have made them no answer. But

the blind men came to Him--which, no doubt, was what He desired.

and Jesus saith unto them, Believe ye that I am able to do this? they said unto him, Yea, Lord--Doubtless our Lord's design was not only to put their faith to the test by this question, but to deepen it, to raise their expectation of a cure, and so prepare them to receive it; and the cordial acknowledgment, so touchingly simple, which they immediately made to Him of His power to heal them, shows how entirely that object was gained.