The response of his organs is automatic; one need not consciously occupy himself with activating his hand. As to the phrase, “without any command or instruction”: When one must exert effort in activating his faculties (e.g., when one dislikes a particular task but forces himself to do it on the strength of logic), this effort is spoken of as an internal command from one faculty to another. However, when one’s will activates the organs of his body, there is no such command involved.