4:19-27 Daniel was struck with amazement and terror at so heavy a judgment coming upon so great a prince, and gives advice with tenderness and respect. It is necessary, in repentance, that we not only cease to do evil, but learn to do good. Though it might not wholly prevent the judgment, yet the trouble may be longer before it comes, or shorter when it does come. And everlasting misery will be escaped by all who repent and turn to God.

27. break off—as a galling yoke (Ge 27:40); sin is a heavy load (Mt 11:28). The Septuagint and Vulgate translate not so well, "redeem," which is made an argument for Rome's doctrine of the expiation of sins by meritorious works. Even translate it so, it can only mean; Repent and show the reality of thy repentance by works of justice and charity (compare Lu 11:41); so God will remit thy punishment. The trouble will be longer before it comes, or shorter when it does come. Compare the cases of Hezekiah, Isa 38:1-5; Nineveh, Jon 3:5-10; Jer 18:7, 8. The change is not in God, but in the sinner who repents. As the king who had provoked God's judgments by sin, so he might avert it by a return to righteousness (compare Ps 41:1, 2; Ac 8:22). Probably, like most Oriental despots, Nebuchadnezzar had oppressed the poor by forcing them to labor in his great public works without adequate remuneration.

if … lengthening of … tranquillity—if haply thy present prosperity shall be prolonged.