It's an interesting remark, more so if Luther actually said it. But did he? We don't know, and we are hoping that some reader may be able to help a poor book-deprived missionary.
Given the surplus of spurious illustrations floating about the ether, as well as those which are genuine but torn savagely from their context, we won't use this remark unless it can be verified. Nor should any of our readers!
Does anybody know the answer?