How do we know we are dead to sin according to the Bible?

Paul explains in Romans 6:2, 'God forbid! How shall we, that are dead to sin, live any longer therein?' This indicates that believers, through their union with Christ, are dead to the mastery of sin. While they still experience its influence and presence, they are no longer under its dominion. Being dead to sin means freedom from the guilt and penalty of sin. Romans 8:1 affirms this: 'There is therefore now no condemnation to them which are in Christ Jesus.' This contrasts the life of a believer, who, though still battling sin, does so from the position of being freed and empowered by Christ.