Why should Christians be concerned about the old nature?

The old nature, or the flesh, is regarded as cursed and incapable of restoration in the Christian life. The sermon warns against attempting to revive or rebuild what God has expressly condemned, emphasizing the need for believers to understand the seriousness of sin. Cursed is he who relies on the flesh, as believers must recognize that their old ways have been judged and should no longer have a hold on them. This perspective fosters a dependency on the power of the Holy Spirit to continually put to death old habits and inclinations, allowing for the growth of the new man created in Christ.