The individual who is known about by others may or may not know that he is known about by them; they in turn may or may not know that he knows or doesn`t know of their knowing about him. Further, while believing that they do not know about him, nonetheless he can never be sure. Also, if he knows they know about him, he must, in some measure at least, know about them; but if he doesn`t know that they know about him, he may or may not know about them in regard to other matters.