Miracles have a purpose. They are to point to God. They are not simply for our benefit.
In the fourth verse Christ answers their question, go and shew John again those things which ye do hear and see; the blind receive their sight, the lame walk, the lepers are cleansed, &c. Jesus Christ demonstrates himself to be the true Messiah, by his miracles which were real and occular proofs of his divinity.
The Christian Soldier, or Heaven Taken by Storm
p. 9
Thomas Watson, The Christian Soldier, or Heaven Taken By Storm (New York: Robert Moore, 1816)