The foolishness of the Galatians can be seen in their willingness to turn away from the fundamental principle of salvation by faith in Jesus Christ. Because of false teachers, the Galatians had turned away from the truth Paul had proclaimed to them, and had begun to depend upon their standing upon the law of Moses to justify themselves before God.
Paul argues against this throughout his epistle to the Galatians, but here he is simply stating his incredulity regarding such a backward move. He states, “Are you so foolish?” (3). Paul had taught them their standing with God was dependent upon their faith in Christ. They had started off so well. But their conversion, (which causes conflict and suffering with an ungodly world), seemed to be in vain because they were now rejecting what they once accepted.
The law of Moses can’t and never could bring the perfection that comes in Christ. This can only come through faith in Him.
