The difference between the nature of vacuum and the nature of substance is that vacuum is knowing. Therefore the prophets have called it the Omniscient God, not in the sense of a person who is knowing but of the Whole Being, the All-knowing Being. Man is so limited; he is limited because his knowledge is limited, and so he thinks, "I alone know. The vacuum which is meaningless to me, which gives no sign of life, to me is nothing." But if he goes further in investigating the nature of vacuum he will find that he himself is nothing, his body, eyes, head, bones, and skin; if there is anything in him which makes him a knowing being, it is the vacuum.