I understand “self mutilation” to be the practice of someone cutting themselves. On the other hand, I’m not exactly sure what you meant by “self-mutilation.” Is “self-mutilation” the same thing as “
extreme penance such as extensive fasting, whipping himself”? Certainly there is historical information that Luther practiced “extreme penance.” I am not though familiar with any historical information that Luther purposefully cut himself- unless you simply are equivocating self-mutilation" with “whipping himself,” which I suspect is the case.
If you have any historical information pertaining to Luther purposefully cutting himself (other than “whipping himself”), I’d very much be interested in seeing it.
Here is a link to a simple Google search using the words
“Martin Luther” and self mutilation. You’ll notice very little helpful returns, which again, implies to me that we’re not using the phrase “self-mutilation” in the same way.
JS