generate questions: The effect of Luther's intervention was immediate. After the sixth sermon, the Wittenberg jurist Jerome Schurf wrote to the elector: "Oh, what joy has Dr. Martin's return spread among us! His words, through divine mercy, are bringing back every day misguided people into the way of the truth."
How quick was the effect of Luther's preaching? {sep_token} Who wrote a resounding letter to the elector praising Luther? {sep_token} At what point in Luther's sermons did Schurf write to the elector? {sep_token} What did Schurf's letter say  Luther's return caused? {sep_token} What type of people were being brought back to the way of truth? {sep_token}