We are always trying to kill. However, this commandment is here to tell us that to think we can kill anything is to lay up trouble for ourselves which will have to be met and wiped out some time or other.
Nothing ever dies from the outside.
No one can kill your character. No one can kill your peace of mind. No one can kill your business, or your reputation, or anything that is yours. You can, but nobody else can. No man or woman was ever yet destroyed from the outside.