In his letter to the Romans, the apostle Paul reminds his readers of the fundamental truth that through faith in Jesus Christ, believers have been freed from the power of sin and death. He emphasizes that the old self, with its sinful desires and passions, has been crucified with Christ and that the new self, which is alive in Christ, is empowered to live a life that is pleasing to God. 
The redemptive work of the Cross not only provides salvation for those who believe in it but also grants victory over the old sin nature. It is important to acknowledge that the sinful nature persists within us until the end of our earthly lives, but the blood of Christ has granted us triumph over its controlling power. 
The power that operates within a believer originates either from the old sinful nature or from the new life in Christ. However, when Christ died, He not only paid the price for sin, but He also died unto sin. This grants victory over the controlling sinful nature and permanently frees us from its grip. By dying unto sin, Christ severs the power that it holds over us and enables us to live in freedom and victory through His resurrection power.

Dear Heavenly Father, I come to You today with a humble heart, recognizing my need for Your grace and mercy. I thank You that through the death and resurrection of Your Son, Jesus Christ, I have been set free from the power of sin and death. I ask that You help me to remember that I am no longer a slave to sin but a child of God, living under the power of Your grace. May Your Holy Spirit guide me and strengthen me as I seek to walk in the newness of life that You have given me. 
In Jesus's name I pray. Amen.