What does the Bible say about being fit for heaven?

Colossians 1:12-13 states that God has made us fit to partake in the inheritance of the saints in light, having delivered us from darkness and translated us into Christ's kingdom. Our fitness for heaven is not based on our works or merits, but solely on what God has accomplished through Jesus Christ for His people. In 1 Corinthians 1:30, we learn that Christ is our wisdom, righteousness, sanctification, and redemption, affirming that our standing before God and readiness for heaven is entirely dependent on Him.