VERSE 3. Are ye so foolish? having begun in the Spirit, are ye now made perfect by the flesh?
Paul now begins to warn the Galatians against a twofold danger. The first danger is: "Are ye so foolish, that after ye have begun in the Spirit, ye would now end in the flesh?"
"Flesh" stands for the righteousness of reason which seeks justification by the accomplishment of the Law. I am told that I began in the spirit under the papacy, but am ending up in the flesh because I got married. As though single life were a spiritual life, and married life a carnal life. They are silly. All the duties of a Christian husband, e.g., to love his wife, to bring up his children, to govern his family, etc., are the very fruits of the Spirit.
The righteousness of the Law which Paul also terms the righteousness of the flesh is so far from justifying a person that those who once had the Holy Spirit and lost Him, end up in the Law to their complete destruction.