But behind those who believe comes a crowd of ignorant people who deny the reality of Sufism, hear discourses on it with incredulous irony, and treat as charlatans those who profess it. To this ignorant crowd the verse applies: "There are those among them who come to listen to thee, and when they leave thee, ask of those who have received knowledge, 'What has he just said?' These are they whose hearts God has sealed up with blindness and who only follow their passions." Among the number of convictions which I owe to the practise of the Sufi rule is the knowledge of the true nature of inspiration. This knowledge is of such great importance that I proceed to expound it in detail. _The Reality of Inspiration: Its Importance for the Human Race_ The substance of man at the moment of its creation is a simple monad, devoid of knowledge of the worlds subject to the Creator, worlds whose infinite number is only known to him, as the Koran says: "Only thy Lord knoweth the number of his armies." Man arrives at this knowledge by the aid of his perceptions; each of his senses is given him that he may comprehend the world of created things, and by the term "world" we understand the different species of creatures. The first sense revealed to man is touch, by means of which he perceives a certain group of qualities—heat, cold, moist, dry. The sense of touch does not perceive colors and forms, which are for it as though they did not exist. Next comes the sense of sight, which makes him acquainted with colors and forms; that is to say, with that which occupies the highest rank in the world of sensation. The sense of hearing succeeds, and then the senses of smell and taste. When the human being can elevate himself above the world of sense, toward the age of seven, he receives the faculty of discrimination; he enters then upon a new phase of existence and can experience, thanks to this faculty, impressions, superior to those of the senses, which do not occur in the sphere of sensation.