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:
At the end of this speech, Luther raised his arm "in the traditional salute of a knight winning a bout." Michael Mullett considers this speech as a "world classic of epoch-making oratory."

Question:
Who considers Luther's speech a world classic?

Michael Mullett