Knowingly and deliberately doing physical harm to one’s own “human” incarnate vehicle is to defile the very temple that one resides within, even though our residence is on a temporary basis.
Knowingly and deliberately doing physical harm to another’s “human” incarnate vehicle is not the behaviour of an evolved “incarnate” individual and invokes tremendous karma and low frequency attachment, especially when the act of “doing harm” brings pleasure.
Clearly one can and does have accidents when embarking upon experiential work when one is incarnate, and this is accepted, as is the “experiential content”, learning and subsequent evolutionary aspect of experiencing the results of accidental damage of the human vehicle, for these are ultimately part of the life plan.
Deliberately damaging the incarnate vehicle in some way to perpetuate its existence “in general”, such as with amputation, surgery etc., is acceptable though. This is because the reasons for such actions are understood and recognized as part of the plan.
The antidote in all instances is to respect, maintain and nurture the human vehicle, recognizing its true worth, importance and longevity. In this way one also respects the “vehicles” of others whilst also recognizing its necessity for evolutionary growth of the incumbent spirit.