16 “I became dumb; and I opened not my mouth”. But it was to guard against “the foolish man,” that “I became dumb, and opened not my mouth.” For to whom should I tell what is going on within me? “For I will hear what the Lord God will speak in me; for He will speak peace unto His people.” But “There is no peace,” says the Lord, “to the wicked.” “I was dumb, and opened not my mouth; because it is Thou that made me.” Was this the reason that you opened not your mouth, “because God made you”?
That is strange; for did not God make your mouth, that you should speak? “He that planted the ear, does He not hear? He that formed the eye, does He not see?” God has given you a mouth to speak with; and do you say, “I was dumb, and opened not my mouth, because You made me”? Or does the clause, “Because You made me,” belong to the verse that follows? “Remove Your stroke away from me”. Because it is “Thou that hast made me,” let it not be Your pleasure to destroy me utterly; scourge, so that I may be made better, not so that I faint; beat me, so that I may be beaten out to a greater length and breadth, not so that I may be ground to powder.
“By the heaviness of Your hand I fainted in corrections.” That is, I “fainted” while You were correcting me. And what is meant by “correcting” me? Except what follows.
Source: The Enarrations, or Expositions, on the Psalms (New Advent)