You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Martin_Luther

Context:
Luther refused to recant his writings. He is sometimes also quoted as saying: "Here I stand. I can do no other". Recent scholars consider the evidence for these words to be unreliable, since they were inserted before "May God help me" only in later versions of the speech and not recorded in witness accounts of the proceedings. However, Mullett suggests that given his nature, "we are free to believe that Luther would tend to select the more dramatic form of words."

Question:
What did Luther refuse to do?

recant his writings