How do we know the foundation of God is true?

The foundation of God is true because it is grounded in God's unchangeable nature. In 2 Timothy 2:19, it emphasizes not just that this foundation exists, but that it is certain, rooted in the divine promise, which cannot be altered. God's faithfulness is not contingent on human behavior; He remains faithful even when we falter. This assurance provides believers with deep confidence that our foundation in Christ, sealed by the Spirit, is irrevocable and steadfast amidst worldly uncertainties.