How do we know that Christ has completed our salvation?

In Colossians 1:16-19, we find a powerful affirmation that all things were created by Christ and for Him. The verses highlight that His works were completed and finished from the foundation of the world, reiterating the past tense of His actions. The phrase 'He hath done all things well' emphasizes that everything Christ needed to perform regarding our salvation has already been accomplished perfectly. Every sinner who believes rests on the finished work of Christ, having assurance that His blood has reconciled them to God and there is nothing left for them to add to that finished work.