When a commandment of the Lord comes, the sin takes it as a premise to resist God, and something within man starts to oppose that commandment. When there is no commandment, there is no desire to do the opposite thing. As soon as the commandment is proclaimed, something within man produces a desire to violate it. That sin entered into man as the result of the disobedience of the first Adam. A committed sin produces death.
Death is a natural consequence of sin.
The man, having sinned, can not have fellowship with God. The relationship with God is broken, and the man becomes spiritually dead regarding God. Our soul may have a desire to serve the Lord with the whole of its strength, yet when there is a commandment, the sin that lives in our flesh, takes it as a premise and deceives us, and kills us by it. The more we endeavor to keep God's Law, the more is manifested the presence of the other sinful law that resists the Lord. Jesus died on the cross to set us free from sin through His death.