How do we know Christ's mercy is assured for His people?

The assurance of Christ’s mercy stems from His nature as a covenant-keeping God. Psalm 123 highlights that when we lift our eyes to the Lord, we depend on His mercy and grace. Throughout Scripture, God reveals His commitment to His people through covenants, promising to be their God and save them. In Isaiah 29:20-23, God promises that the scorner will be consumed and that He will defend those He has justified. This speaks to Christ's accomplishment of redemption—He didn’t merely make salvation available; He achieved it for His people. When we trust in Him, we await His mercy assured by His covenant. Believers are guaranteed mercy not based on their performance but on Christ’s finished work, hence they can confidently cry out, “Lord, have mercy on us,” trusting in His promise to fulfill that mercy.