v1: Judah will sing the song of salvation. God’s salvation is our walls and bulwarks; for we no longer rely on a physical fortress. Here is our security. This contrasts with the walls of Moab, which are destroyed (25.10-12). The image of walls is that they are our protection and salvation, and from God.
v2: In God the nation can be righteous, and can enter the fullness of His blessings. First Christ opened the gate of the righteous, Ps 118.19-20, and now those who follow Him.
v3-4: Our experience of God’s security; the objective fact becomes reality in our lives, as perfect peace. Our part is a mind fixed (or leaning, depending, as in 36.5) on Him. This is to do with simple trust in God, and is an essential part of our lives. We have confidence in the everlasting strength of God.
v5-6: See 25.12; we should not identify with those whom God has promised to bring down. Victory is seen not primarily as something military, but something moral, where the proud are brought low.
v7-9: God is just, therefore we must be just also; His justice will be made manifest amongst the nations. We should seek Him, Ps 63.1; Prov 8.17; seek Him early, meaning making a costly effort to know Him.
v10-11: Even though God shows grace to the wicked, they will not repent. This may refer to ungodly Jews living amongst the righteous; Matt 8.10-12; 11.20-24. The fire prepared for His enemies will consume them. When God blesses His own people, He gives opportunity for the ungodly to repent.
v12-15: Gratitude to God for His faithfulness; all the good in our lives is His work of grace. In the light of God’s grace, we recognise our own folly and sins, and shown proper remorse and repentance; now we honour only Him.
Those who do not know God have a destiny apart from Him. We must learn this lesson well, and put our trust in the eternal one.
v16-18: Israel’s sorrow and pain, but by disobedience and unfaithfulness they brought forth nothing; Hag 1.6. There was the pain of childbirth, but no child. The people of God were supposed to be a blessing to the world, but failed.
v19: Hope in dark days. The Jewish people held a hope in the resurrection from the dead; Job 19.25-27. There are many who claim to have power over life and death, such as witchdoctors and sorcerers, but God’s people must not fear them.
v20-21: People of God commanded to avoid the judgment about to fall, as in 24.1-20; Matt 24.15-21. We should not be judged with the ungodly, and we must therefore not live like them.