Paul teaches us that no one can add or take away from the grace of God. We as Christians need to understand that our flesh is at war with the Holy Spirit who dwells in us as born again Christians. We tend to try to lean on our flesh to walk with the Lord, which is legalism, but Paul tells us that we are free in Christ and need to live free for the Lord and not for our fleshly desires. Paul gives us a list in Galatians 5:19-21