How do we know that God's covenant of grace holds true?

The certainty of God's covenant of grace is grounded in His eternal purpose and faithfulness, as highlighted in Psalm 63 where David praises God's lovingkindness. This covenant was established long before creation and is realized in the life, death, and resurrection of Jesus Christ, who takes hold of His people and fulfills the terms of the covenant. As Paul expresses in Philippians 3, we see the experiential aspect of this grace, where believers are apprehended by Christ, confirming that God's promises are secured in His loving purpose.