Isaiah 28 is possibly the clearest presentation of God’s people being made up of two groups: counterfeit believers and true believers.  The intention of chapter 28 is to move true believers towards trusting God’s invitation to rest in Him.  Verses 12 states why Ephraim and its leadership were to be judged: “to whom [the Lord] said, ‘This is rest…’; yet they would not hear.”  In contrast to Ephraim, true believers do listen to God’s Word, they trust in God’s “precious cornerstone” (v. 16), and they experience the results: “Whoever believes will not be in haste.”  Chapter 28 forces us to look at all the stressors in life that cause us to worry and be anxious.  It forces us to look at the times when we’re tempted to believe that God cannot deliver us. It forces us to look at all those other sources of rest we might be tempted to trust.  The example of Ephraim and the leadership teaches us to “go and do otherwise.”  By exposing their unbelief, Isaiah urges true believers to believe in Christ and to live out that faith in the form of righteousness.