For this school there is no problem of evil, because ethical distinctions do not apply to God's doings. Whatever God does is good. The other school came under the influence of Greek thought and identified the idea of God with the idea of the Good. They maintained that from the nature of God's essence it was not only his duty to do the good, but that it was impossible for him to do anything else. Doing good is a necessity of his nature, and our good and evil are also his good and evil. Ethical values are absolute and not relative.
Neither of these radical views can be maintained. The first is refuted by its own consequences which only very few of its advocates were bold enough to adopt. The possibility of God telling a falsehood, which is implied in the purely human validity of good and evil, is subversive of all religion. God would then cease to be trustworthy, and there would be no reason for giving him obedience. Besides, if revelation alone determines right and wrong, it would follow that if God chose to reverse his orders, our moral judgments would be turned the other way around, good would be evil, and evil good. Finally, if good and bad are determined by the will of God only, those who do not believe in revelation would be without an idea of right and wrong, but this is manifestly not true.
But the other opinion, that God is compelled by the necessity of his nature to do the good, is also erroneous. In the first place it detracts from God's omnipotence to say he cannot do wrong. Besides, if he is compelled by an inner necessity to do the good, he must always have done this, and the world would have existed from eternity. It is just as wrong to say that it is the duty of God to do what is good and useful for man. For this is due to a confusion of the good or generous with the obligatory. Any deed to which no blame attaches may be called good. If no praise attaches to it either, it is indifferent. If it is deserving of praise and its omission does not call forth blame, it is a generous act. A duty is an act the omission of which deserves blame.
Now the truth in the question under discussion is midway between the two extremes. God is able to do good as well as evil, and is under no necessity. The notions of right and wrong are absolute and not merely relative. God never does wrong because evil has no attractive power per se. Wrong is committed always as a means to an end, namely, to gain an advantage or avoid an injury. God is not dependent upon anything; he needs no advantages and fears no injuries. Hence there is nothing to prompt him to do wrong. The good on the other hand attracts us by its inherent goodness, not for an ulterior end. If the good were done only for the sake of deriving some benefit external to the good itself, God, who is self-sufficient, would not do anything either good or evil. God does the good always and not the bad, because in his wisdom he sees the difference between them. It was a deed of generosity in God to have created the world and given life to his creatures, but it was not a duty.
This conception of the nature of good and evil leaves on our hands the problem of evil. Why does a good God permit disease and suffering to exist in the world? In particular, how explain the suffering and death of innocent children and harmless animals?
The answer of Al-Basir is that infliction of pain may under certain circumstances be a good instead of an evil. In human relations a person is permitted to inflict pain on another in self-defence, or to prevent the pain from becoming worse, as, for example, when a finger is amputated to save the hand. The infliction of pain is not only permitted, it becomes a duty in case of retribution, as in a court of justice; and finally it is permitted to inflict temporary pain if it will result in a greater advantage in the future. The last two cases apply also to God's treatment of his creatures. Disease and suffering are either punishment for offences committed, or are imposed with a view to later reward. In the case of children the last explanation alone is applicable. They will be rewarded in the next world. At the same time the parents are admonished to repentance and good conduct.
The most difficult question of the section on justice is that of free will and foreknowledge. Is man master of his actions? If so, how can we reconcile this with God's omniscience, who knows beforehand how the person will act at a given moment? Is man free to decide at the last moment in a manner contrary to God's knowledge? If so, we defend freedom at the expense of God's omniscience. If man is bound to act as God foreknew he would act, divine knowledge is saved, man's freedom lost. Al-Basir has no doubt man is free. Our own consciousness testifies to this. When we cut off our finger bitten by a snake, we know that we ourselves did it for a purpose, and distinguish it from a case of our finger being cut off by order of an official, before whom we have been accused or maligned. One and the same act can have only one author and not two, and we know that we are the authors of our acts. There is a much closer connection between an agent and his act than between a knower and his knowledge, which may be the common property of many, and no one doubts that a man's knowledge is his own.
The dilemma above mentioned with its two horns, of which one denies God's knowledge, the other man's freedom, is puzzling enough, to be sure. But we are not bound to answer it since it is purely hypothetical. We do not know of a real instance in which a man's decision tended to be contrary to God's foreknowledge of its outcome. Just as we should refuse to answer the question whether an actual case of injustice on the part of God would prove his ignorance or dependence, because we know through irrefutable proofs that God is wise and without need; so here we say man has freedom though God knows he will act thus and so, and refuse to say whether in case the unbeliever turned believer it would prove God's ignorance or change in his knowledge.
God's creation was a pure act of grace. But once having done this and communicated to us a knowledge of himself and his will, it is now his duty to guide us in the right path, by sending us his prophets. The commandments and prohibitions must never be contrary to the knowledge of reason. We must see in the commandments means of guidance, in the prohibitions a protection against destructive influences. If they had not this rational basis, we do not see why God should have imposed them upon us.
Having given us reason to know his being, and having announced his truth through the prophets, it is his duty to reward those who knew him and were obedient, eternally in the next world, and to punish eternally the unbeliever. If one has merits and sins, they are balanced against each other. If the sinner repents of his evil deeds, it is the duty of God to accept his repentance and remit his punishment.