Come on CG; tell us why you want to hurt people necessarily.
Many want to know....
The quote in question regards things like setting a broken bone and pulling a tooth as hurting other people, but that these are done out of necessity.
You should read some of this sage's writings before you make any more snides over a quote which you didn't understand.
If you are going to QUOTEMINE, then don't be upset if we mere mortals do not Google® the REST of an authors stuff and get fully up to speed!