Under Henry I of England "who sins unwittingly shall knowingly make amends" though the lunatic and infant were not liable in criminal acts, which was a change from Anglo-Saxon law. Bracton wrote of homicide, "the crime of homicide, be it either accidental or voluntary, does not permit of suffering the same penalty, because on one case the full penalty must be exacted and in the other there should have been mercy." It is the first signs of discrimination in the law leading to the development of the concept of mens rea (a guilty mind being necessary to be guilty of a crime). Bracton stressed the animus furendi in theft, that is the intention to steal. Felony is according to intent, a concept that has its foundations in Bracton.