What does Isaiah 26:12 mean?
The tone of Isaiah's song of praise to the Lord shifts once again. After calling for the Lord to judge the wicked (Isaiah 26:11), he now expresses his confidence that the Lord will eventually ordain peace for His people Israel. The Lord will win the peace for them again and, in the end, permanently.Another layer is added to Isaiah's confidence: God has done this before. Isaiah gives credit to God for all that Israel has ever accomplished. The Lord has always been with them (Deuteronomy 7:6–8). He has been the source of every previous victory in Israel's long history (Psalm 44:1–3). The God who brought them this far has proven that He is both powerful and faithful.
Every believer in Jesus can say the same thing and with the same confidence. We find assurance and hope in Paul's words to the Christians in Philippi, "And I am sure of this, that he who began a good work in you will bring it to completion at the day of Jesus Christ" (Philippians 1:6).