How do we know the doctrine of covenant kindness is true?

The doctrine of covenant kindness is supported by the way God's dealings with humanity are structured around promises made long before individuals' existences. The example of David and Mephibosheth illustrates that David's kindness stems from a covenant established with Jonathan. Similarly, God's kindness comes from His eternal covenant with His people, chosen in Christ before the foundation of the world (Ephesians 1:4-5). This assurance of grace stands not on human actions but on divine promises, reflecting God's faithfulness.