John Chrysostom
He takes the deaf and dumb man who was brought to Him apart from the crowd, that He might not do His divine miracles openly; teaching us to cast away vain glory and swelling of heart, for no one can work miracles as he can, who loves humility and is lowly in his conduct. But He puts His fingers into his ears, when He might have cured him with a word, to shew that His body, being united to Deity, was consecrated by Divine virtue, with all that He did. For since on account of the transgression of Adam, human nature had incurred much suffering and hurt in its members and senses, Christ coming into the world shewed the perfection of human nature in Himself, and on this account opened ears with His fingers, and gave the power of speech by His spittle. Wherefore it goes on, And spit, and touched his tongue.
He at the same time also groaned, as taking our cause upon Himself, and pitying human nature, seeing the misery into which it had fallen.
By which He has taught us not to boast in our powers, but in the cross and humiliation. He also bade them conceal the miracle, lest He should excite the Jews by envy to kill Him before the time.