What does it mean that Galatians is progressive revelation?
It means God did not reveal everything at once from the beginning; instead, He progressively adds revelation upon revelation, building truth over time. In Galatians, this unfolds as the blessing of Abraham coming to Gentiles through Jesus Christ, as taught in Galatians 3:13-14.
Les teaches that Galatians is progressive revelation, meaning God doesn't always reveal everything exactly from the front. He keeps adding revelation to revelation. In the immediate context, Galatians 3:13 declares that Christ redeemed us from the curse of the law, being made a curse for us, for it is written, Cursed is every one that hangeth on a tree. Verse 14 then explains that this was accomplished so that the blessing of Abraham might come on the Gentiles through Jesus Christ. So progressive revelation means later revelation builds on earlier promises, showing how the blessing of Abraham extends to Gentiles through Christ.