_Ibrahim b. Sayar an-Nazzam_ (d. 231), the next great Mu`tazilite leader was a devoted student of the Greek philosophers and an encyclopædic writer. In this he was typical of the earlier Arabic philosophers whose endeavour was to apply Greek science to the interpretation of life and nature generally, an aim which necessarily tended to produce encyclopædic compilations rather than original studies in any one field of knowledge. Already the Mu`tazilites had reached the position that good and evil represent objective realities and that God, knowing the good, does not will that which is contrary to it; but an-Nazzam presses this further and asserts that God can do nothing in the creature save what is for its good and is in itself just. To this the objection was raised that in such case God’s own acts are determined and are not free. An-Nazzam replied that he admitted this determination, not in action but in potentiality as God is restricted by his own nature. He attempted to reproduce the ancient doctrine that the soul is the form of the body, as had already been asserted by Aristotle, but he misunderstood the terminology employed and represents the soul as of the same shape as the body. This implies that the soul is a very subtile kind of substance permeating the whole body in the same way as butter permeates milk, or as oil permeates the sesame: both soul and body are equal in size and alike in shape. Freedom of the will is peculiar to God and man, all other created things are subject to necessity. God created all things at once in remote eternity, but reserved them in a state of quiescence so that they may be described as “concealed,” and then projected them into active existence at successive intervals. The next great Mu`tazilite leader was _Bishr b. Mu`tamir_ (d. 226 circ.) in whose work we find a more definite attempt to apply philosophical speculation to the practical needs of Islam. In the case of free will he enters directly into the question of how far external influences limit freedom of the will and so diminish responsibility. Infants cannot be condemned to eternal punishment because they have no responsibility, having never exercised free will. Unbelievers, however, are condemned to punishment because, although they have not the help of revelation, it is possible for them to know that there must be a God, and only one God, by the light of reason. In dealing with actions and their moral values we have to consider not only one agent and one object, but often a series, the act being transmitted from one to the other so that each of the intervening objects becomes the agent to the next object. This serial connection he termed “begetting” (_tawullud_).