The Christian life is the life of sons and daughters; it is not the
life of slaves. It is freedom, not bondage. Of course, we are slaves of
God, of Christ, and of one another. We belong to God, to Christ, to one
another, and we love to serve those to whom we belong. But this kind of
service is freedom.
What the Christian life is not, is a bondage to the law, as if our
salvation hung in the balance and depended on our meticulous and slavish
obedience to the letter of the law.
As it is, our salvation rests upon the finished work of Christ, on His sin-bearing, curse-bearing death, embraced by faith.