 Famously Locke calls the concept of a person a forensic concept. For Locke much of the importance attaching to being the same person is that moral responsibility for past deeds goes with being the same person, rather than being the same man or even the same immaterial substance, as a past person. In his view it is enough to be morally responsible for some deed that one is the same person as its performer. It is not required that one be the same man or the same immaterial substance as the one who performed the act in question.