Galatians 2:20 I have been crucified with Christ and I no longer live, but Christ lives in me. The life I live in the body, I live by faith in the Son of God, who loved me and gave himself for me.
In Matthew 15:10-20 Jesus tells us plainly that what causes us to sin is internal not external. Paul in Romans 7:17,18,24 tells us plainly that sin dwells in us and is the cause of our wrong being and doing. In Colossians 2:20-23 Paul also instructs us that external practices and circumstances have no value in stopping sensual indulgence (or sinful desires that lead to sinful practices).
Who will deliver us from our body of death, from sin that dwells in us? Jesus is our deliverer. Peter tells us in 1 Peter 2:24 "He Himself bore our sins in His body on the tree (cross), that we might die to sin and live to righteousness. By His wounds you have been healed." Jesus freed us from obedience to sin when He died on the cross (Romans 6:6-7). When we believe the gospel, we receive the Holy Spirit, the Spirit of Christ, Christ, the Spirit of God, to live in us (Ephesians 1:13:14; Romans 8:9-11; please read these references.) We have the power of God and resources of God living in us! Galatians 2:20 answers the question, "How can I overcome the inner sinful desires?"
We overcome by being crucified with Christ. We are crucified with Christ when we repent of sin and believe Christ died on the cross for our sins , rose again from the dead on the third day and is Lord of all (Mark 1:15; 1 Corinthians 15:3-4; Romans 10:9). Being crucified with Christ removes us from the penalty and power of sin (Romans 6:6-7).
We overcome the sinful desires because we have Christ internally empowering our life. Nothing is impossible for God and Christ is God (Luke 1:37) and lives in us.
We overcome the sinful desires by exercising faith in the Son of God. We exercise faith when we attempt to obey Jesus as Lord, fully expecting Him to fulfill our attempt with His power. Our attempt needs to be to the point of suffering death (1 Peter 4:1). As we live by faith in the Son of God we overcome sinful desires and habits. When we overcome by the power of Jesus Christ, we don't fall prey to external provocations to indulge our sinful nature. I like to eat potato chips and they are damaging to my health in the quantities I like to eat. Is the solution not to have any around the house so I don't eat them or is it don't eat them by exercising faith in Jesus? The latter is the solution. If the latter is the solution, then I won't buy any to keep around the house, but even if some are around I won't eat them. This solution is not an external solution. Not keeping them at my house as a solution will not work because I will encounter them at a party and eat to many or I will go buy some to fulfill my craving. The only solution to our sinful indulgence is taught in Galatians 2:20.
Memorize Galatians 2:20. Meditate on Galatians 2:20. Hear and understand what God is saying to us in Galatians 2:20. Ask Jesus to explain Galatians 2:20 to you. Act on Galatians 2:20 so you can confidently say with Paul, "I have been crucified with Christ and I no longer live, but Christ lives in me. The life I live in the body I live by faith in the Son of God, who loved me and gave Himself for me."