Romans 6:16 : Know ye not, that to whom ye present yourselves as servants unto obedience, his servants ye are whom ye obey; whether of sin unto death, or of obedience unto righteousness? Although we have been bought from the bondage of sin by the blood of Christ, God does not force us to accept the freedom bought for us. In those days captives in war were forced into slavery. Such men had no choice. But it is not so under the reign of Christ. We are not forced to be servants of sin, nor does God force us to be servants of righteousness.
A man presents himself as a servant of sin or as a servant of righteousness. But Paul was here writing to Christians, and his language is a warning to us not to indulge in sin on the grounds that we are not under law, but under grace. To do so is to become servants of sin. The life we live determines whose servants we are. To become servants of sin leads to death, but gospel obedience leads to righteousness. And the language of Paul shows that the Christian is as free to choose whom he will serve as is the alien sinner.
To say that the Chris-tian will always choose to continue his service to God is to beg the question, and to make this verse and the remaining part of the sixth chapter without point or reason.