There will be no eating and drinking in the next world, and hence no need of a heaven and an earth like ours, but there will be place and time, since creatures cannot do without it. There will be no succession of day and night, for these are of use only for our present life and occupations, but will be unnecessary there. There will, however, be a special period for worship.
Reward and punishment in the next world will both be eternal. It stands to reason that God should promise eternal reward and punishment so as to inspire mankind with the highest possible degree of hope and fear, that they may have no excuse for not heeding the commandments so forcibly impressed upon them. Having made the promise, his justice prompts him to fulfil it, and those who suffer have themselves to blame.
We have now completed in outline Saadia's system of Judaism. There are many details which we necessarily had to leave out, especially in the more dogmatic part of his work, that dealing with specific Jewish doctrines, which he constructs on the basis of Rabbinical literature and Biblical allusions interpreted so as to harmonize with the statements of the Rabbis. Many questions specifically theological and eschatological assumed importance in his mind by reason of his surroundings. I mean the Mohammedan schools and sects, and the Karaite discussions which were closely modelled after them. The most important part of his system philosophically is that which deals with creation and the attributes of God. His discussions of the soul and of free will are less thorough, and the details of his doctrines of resurrection, future reward and punishment, the redemption of Israel and the Messiah are almost purely dogmatic. For a scientific ethic there is no room at all in the body of his work. A man's conduct is prescribed for him in the divine commandments, though in a general way the reason sees the right and the wrong of the so-called rational group of laws. Still as an after thought Saadia added a chapter to the "Emunot ve-Deot" in which he attempts to give a psychological basis for human conduct. Noting the various tendencies of individuals and sects in his environment to extremes in human behavior, some to asceticism, some to self-indulgence, be it the lust of love or of power, he lays emphasis on the inadequacy of any one pursuit for the demands of man's complex nature, and recommends a harmonious blending of all things for which men strive.[79]
God alone, he says, is a real unity, everything else is by the very reason of its being a creature essentially not one and simple, but composite and complex. So man has a love and desire for many things, and also aversion for many things. And as in other objects in nature it takes a combination of several elements to constitute a given thing, so in man it is by a proper systematization of his likes and dislikes that he can reach perfection of character and morals. It cannot be that God intended man to pursue one object all his life to the exclusion of all others, for in that case he would have implanted only one desire in man instead of many. You cannot build a house of stones alone neither can you develop a perfect character by one pursuit and one interest.
Pursuit of one thing is likely to result in harm, for example, over-indulgence in eating brings on disease. Wisdom is therefore needed in regulating one's conduct. The principle here is control of one's likes and dislikes. Of the three faculties of the soul, reason, spirit and desire, reason must be the master of the other two. If any matter occurs to a person's imagination, he must try it with his reason to see whether it is likely to benefit or injure him, and pursue or avoid it accordingly. If, on the other hand, he allows the lower parts of his soul to rule his reason, he is not a moral man.
The reader will recognize Plato in the last statement. The division of the soul into the three faculties of reason, spirit and desire is Platonic, as we have already seen, and the attempt to base an ethic on the proper relation between the powers of the soul also goes back to Plato. But Saadia tries to show that the Bible too favors this conception.
When Ecclesiastes tells us (1, 14), "I have seen all the works that are done under the sun; and, behold, all is vanity and a striving after wind," he does not mean that there is nothing worth striving after, for he would then be condemning the objects of God's creation. His meaning is that it is vain to pursue any one thing to the exclusion of every other. He then proceeds to name three prominent objects of pursuit, wisdom, pleasure and worldly gain—all is vain when taken by itself. A proper combination of all is to be recommended as is delicately hinted in the same book (2, 3), "I searched in mine heart how to cheer my flesh with wine, mine heart yet guiding me with wisdom, and how to lay hold on folly."