Luther and the "Popular" gospel

The excerpt below is from Luther’s 1531 Galatians commentary.

We do not seek the favor of men by our doctrine, for we teach that all men are ungodly by nature and are children of wrath. We condemn the free will of man, his strength, wisdom, righteousness, and all religion of man’s own devising (religionem voluntariam). In short, we say that there is nothing whatever in us that serves to merit grace and the remission of sins. But we preach that we obtain this grace only and merely by the mercy of God for Christ’s sake….This surely is not preaching to please men and the world; for nothing can more deeply and bitterly irritate the world than then condemnation of its wisdom, righteousness, religion, and power….So we, with Paul, most confidently and certainly pronounce accursed all doctrine that does not agree with ours; for by our preaching we are seeking neither the applause of men nor the favor of princes and bishops but the favor of God alone. His grace and gift alone we preach, despising and condemning, whatever is of ourselves.