Isaiah 30:18
18Therefore the LORD will wait, that he may be gracious to you; and therefore he will be exalted, that he may have mercy on you, for the LORD is a God of justice. Blessed are all those who wait for him.
Wesley: wait—patiently expect your repentance. Exalted—he will work gloriously. Judgment—or mercy. That wait—in his way, with faith and patience. The Lord waiting is still mercy over the Judah that would not return in v. 15.
God waits to show mercy even to a people who refused him in v. 15. The blessing belongs to those who wait for him in turn.
Calvin: therefore will Jehovah wait. The Prophet now adds consolation; he intended to soothe their minds, and encourage them to hope for better things. He contrasts this waiting with the excessive haste against which he spoke at the beginning of the chapter. The Lord will not render like for like, and will not in that manner hasten to punish them. Jehovah is a God of judgment: God exercises moderation in inflicting punishment, because he is inclined to mercy. Blessed are all that wait for him.
He is not like us; he does not act with bustling or hurry, otherwise at every moment we must perish. The waiting is the Lord’s over Judah after the Egypt haste.
Key contrast Both keep the Lord waiting to be gracious to Judah after the Egypt plan. Wesley reads the wait as the Lord patiently expecting their repentance, judgment as mercy, the blessed as those who wait in his way with faith and patience. Calvin reads the wait as God himself refusing like-for-like haste: a God of judgment meaning moderation in chastening, not severity that would ruin those whose salvation he promotes.