What does 'ordered in all things and sure' mean in the context of God's promise?

When David mentions that the covenant with God is 'ordered in all things and sure,' he highlights the perfect security and reliability of God’s promises. This phrase means that all aspects of the covenant have been predetermined and fulfilled by God, ensuring it cannot be broken or altered by human failure. It indicates that the covenant's foundation rests solely on Christ's obedience rather than ours. Consequently, believers can have assurance that their salvation is secure because it does not depend on their ability to uphold the covenant but on Christ who fulfilled all requirements. This idea is central in Reformed theology, emphasizing God’s sovereign work in the salvation of sinners.