their effects and results, so are the good and the evil different front each other and contradictory in their effects and results; they are neither alike in their outward appearance nor can they be alike in their results. 2-That God after giving the human self powers of the body, sense and mind has not left it uninformed in the world, but has instilled into his unconscious by means of a natural inspiration the distinction between good and evil, right and wrong, and the sense of the good to be good and of the evil to be evil. 3-That the future of man depends on how by using the powers of discrimination, will and judgement that Allah has endowed him with, he develops the good and suppresses the evil tendencies of the self. If he develops the good inclination and frees his self of the evil inclinations, he will attain to eternal success, and if, on the contrary, he suppresses the good and promotes the evil, he will meet with disappointment and failure. Sahl al-Tustari (d. 896), a Sufi and scholar of the Qur'an, mentions, "By the day when it reveals her [the sun],He said:This means: the light of faith removes the darkness of ignorance and extinguishes the flames of the Fire. 11-15 Historical precedent of the people of Thamud In the second part citing the historical precedent of the people of Thamud the significance of prophethood has been brought out. A messenger is raised in the world, because the inspirational knowledge of good and evil that Allah has placed in human nature, is by itself not enough for the guidance of man, but on account of his failure to understand it fully man has been proposing wrong criteria and theories of good and evil and thus going astray. That is why Allah sent down clear and definite revelation to the prophets to augment man's natural inspiration so that they may expound to the people as to what is good and what is evil. Likewise, the prophet Saleh was sent to the people of Thamud, but the people overwhelmed by the evil of their self, had become so rebellious that they rejected him. And when he presented before them the miracle of the She-Camel of God, as demanded by themselves, the most wretched one of them, in spite of his warning, hamstrung it, in accordance with the will and desire of