A similar attitude was also assumed by either religion towards the facts of economic life. In either case the religious point of view is characteristic. The reaction against the tendency to condemn secular life is certainly stronger in Islam, but is also apparent in Christianity. Thomas Aquinas directly stigmatises trade as a disgraceful means of gain, because the exchange of wares does not necessitate labour or the satisfaction of necessary wants: Muhammedan tradition says, "The pious merchant is a pioneer on the road of God." "The first to enter Paradise is the honourable merchant." Here the solution given to the problem differs in either case, but in Christian practice, opposition was also obvious. Common to both religions is the condemnation of the exaction of interest and monetary speculation, which the middle ages regarded as usury. Islam, as usual, gives this Christian idea the form of a saying enounced by Muhammed: "He who speculates in grain for forty days, grinds and bakes it and gives it to the poor, makes an offering unacceptable to God." "He who raises prices to Muslims (by speculation) will be cast head downwards by God into the hottest fire of hell." Many similar traditions fulminate against usury in the widest sense of the word. These prohibitions were circumvented in practice by deed of gift and exchange, but none the less the free development of commercial enterprise was hampered by these fetters which modern civilisation first broke. Enterprise was thus confined to agriculture under these circumstances both for Christianity and Islam, and economic life in either case became "mediaeval" in outward appearance.
Methods of making profit without a proportional expenditure of labour were the particular objects of this aversion. Manual labour was highly esteemed both in the East and West. A man's first duty was to support himself by the work of his own hands, a duty proclaimed, as we know, from the apostolic age onwards. So far as Islam is concerned, this view may be illustrated by the following utterances: "The best of deeds is the gain of that which is lawful": "the best gain is made by sale within lawful limits and by manual labour." "The most precious gain is that made by manual labour; that which a man thus earns and gives to himself, his people, his sons and his servants, is as meritorious as alms." Thus practical work is made incumbent upon the believer, and the extent to which manufacture flourished in East and West during the middle ages is well known.
A similar affinity is apparent as regards ideas upon social position and occupation. Before God man is but a slave: even the mighty Caliphs themselves, even those who were stigmatised by posterity as secular monarchs, included in their official titles the designation, "slave of God." This theory was carried out into the smallest details of life, even into those which modern observers would consider as unconcerned with religion. Thus at meals the Muslim was not allowed to recline at table, an ancient custom which the upper classes had followed for centuries: he must sit, "as a slave," according to the letter of the law. All are alike slaves, for the reason that they are believers: hence the humiliation of those whom chance has exalted is thought desirable. This idealism is undoubtedly more deeply rooted in the popular consciousness of the East than of the West. In the East great social distinctions occur; but while religion recognises them, it forbids insistence upon them.
As especially distinctive of social work in either religion we might be inclined to regard the unparalleled extent of organizations for the care of the poor, for widows and orphans, for the old, infirm and sick, the public hospitals and almshouses and religious foundations in the widest sense of the term; but the object of these activities was not primarily social nor were they undertaken to make life easier for the poor: religious selfishness was the leading motive, the desire to purify self by good works and to secure the right to pre-eminence in heaven. "For the salvation of my soul and for everlasting reward" is the formula of many a Christian foundation deed. Very similar expressions of hope for eternal reward occur in Muhammedan deeds of gift. A foundation inscription on a mosque, published by E. Littmann, is stated in terms the purport of which is unmistakable. "This has been built by N or M: may a house be built for him in Paradise (in return)." Here again, the idea of the house in Paradise is borrowed from Christian ideas.
We have already observed that in Islam the smallest trivialities of daily life become matters of religious import. The fact is especially apparent in a wide department of personal conduct. Islam certainly went to further extremes than Christianity in this matter, but these customs are clearly only further developments of Christian regulations. The call to simplicity of food and dress has already been mentioned. But even the simplest food was never to be taken before thanks had been given to God: grace was never to be omitted either before or after meals. Divine ordinances also regulated the manner of eating. The prophet said, "With one finger the devils eat, with two the Titans of antiquity and with three fingers the prophets." The application of the saying is obvious. Similar sayings prescribe the mode of handling dishes and behaviour at a common meal, if the blessing of God is to be secured. There seems to be a Christian touch in one of these rules which runs, in the words of the prophet: "He who picks up the crumbs fallen from the table and eats them, will be forgiven by God." "He who licks the empty dishes and his fingers will be filled by God here and in the world to come." "When a man licks the dish from which he has eaten, the dish will plead for him before God." I regard these words as practical applications of the text, "Gather up the pieces that remain, that nothing be lost" (Matt. xiv. 10: John vi. 12). Even to-day South Italians kiss bread that has fallen to the ground, in order to make apology to the gift of God. Volumes might be filled with rules of polite manners in this style: hardly any detail is to be found in the whole business of daily life, even including occupations regarded as unclean, which was not invested with some religious significance. These rules are almost entirely dictated by the spirit of early Christianity and it is possible to reconstruct the details of life in those dark ages from these literary records which are now the only source of evidence upon such points. However, we must here content ourselves with establishing the fact that Islam adopted Christian practice in this as in other departments of life.
The state, society, the individual, economics and morality were thus collectively under Christian influence during the early period of Muhammedanism. Conditions very similar in general, affected those conceptions which we explain upon scientific grounds but which were invariably regarded by ancient and mediaeval thought as supernatural, conceptions deduced from the phenomena of illness and dreams. Islam was no less opposed than Christianity to the practice of magic in any form, but only so far as these practices seemed to preserve remnants of heathen beliefs. Such beliefs were, however, continued in both religions in modified form. There is no doubt that ideas of high antiquity, doubtless of Babylonian origin, can be traced as contributing to the formation of these beliefs, while scientific medicine is connected with the earlier discoveries of Greece. Common to both religions was the belief in the reality of dreams, especially when these seemed to harmonise with religious ideas: dreams were regarded as revelations from God or from his apostles or from the pious dead. The fact that man could dream and that he could appear to other men in dreams after his death was regarded as a sign of divine favour and the biographies of the saints often contain chapters devoted to this faculty. These are natural ideas which lie in the national consciousness of any people, but owe their development in the case of Islam to Christian influence. The same may be said of the belief that the prayers of particular saints were of special efficacy, and of attempts by prayer, forms of worship and the like to procure rain, avert plague and so forth: such ideas are common throughout the middle ages. Thus in every department we meet with that particular type of Christian theory which existed in the East during the seventh and eighth centuries.
This mediaeval theory of life was subjected, as is well known, to many compromises in the West, and was materially modified by Teutonic influence and the revival of classicism. It might therefore be supposed that in Islam Christian theory underwent similar modification or disappeared entirely. But the fact is not so. At the outset, we stated, as will be remembered, that Muhammedan scholars were accustomed to propound their dicta as utterances given by Muhammed himself, and in this form Christian ideas also came into circulation among Muhammedans. When attempts were made to systematise these sayings, all were treated as alike authentic, and, as traditional, exerted their share of influence upon the formation of canon law. Thus questions of temporary importance to mediaeval Christianity became permanent elements in Muhammedan theology.
One highly instructive instance may be given. During the century which preceded the Byzantine iconoclastic controversy, the whole of nearer Asia was disturbed by the question whether the erection and veneration of images was permissible. That Constantinople attempted to prohibit such veneration is well known: but after a long struggle the church gained its wishes. Islam was confronted with the problem and decided for prohibition, doubtless under Jewish influence. Sayings of Muhammed forbid the erection of images. This prohibition became part of canon law and therefore binding for all time: it remains obligatory at the present day, though in practice it is often transgressed. Thus the process of development which was continued in Christendom, came to a standstill in Islam, and many similar cases might be quoted.
Here begins the development of Muhammedan jurisprudence or, more exactly, of the doctrine of duty, which includes every kind of human activity, duties to God and man, religion, civil law, the penal code, social morality and economics. This extraordinary system of moral obligations, as developed in Islam, though its origin is obscure, is doubtless rooted in the ecclesiastical law of Christendom which was then first evolved. I have no doubt that the development of Muhammedan tradition, which precedes the code proper, was dependent upon the growth of canon law in the old Church, and that this again, or at least the purely legal part of it, is closely connected with the pre-Justinian legislation. Roman law does not seem to me to have influenced Islam immediately in the form of Justinian's Corpus Juris, but indirectly from such ecclesiastical sources as the Romano-Syrian code. This view, however, I would distinctly state, is merely my conjecture. For our present purpose it is more important to establish the fact that the doctrine of duty canonised the manifold expressions of the theory that life is a religion, with which we have met throughout the traditional literature: all human acts are thus legally considered as obligatory or forbidden when corresponding with religious commands or prohibitions, as congenial or obnoxious to the law or as matters legally indifferent and therefore permissible. The arrangement of the work of daily life in correspondence with these religious points of view is the most important outcome of the Muhammedan doctrine of duties. The religious utterances which also cover the whole business of life were first made duties by this doctrine: in practice their fulfilment is impossible, but the theory of their obligatory nature is a fundamental element in Muhammedanism.
Where the doctrine of duties deals with legal rights, its application was in practice confined to marriage and the affairs of family life: the theoretical demands of its penal clauses, for instance, raise impossible difficulties. At the same time, it has been of great importance to the whole spiritual life of Islam down to the present day, because it reflects Muhammedan ideals of life and of man's place in the world. Even to-day it remains the daily bread of the soul that desires instruction, to quote the words of the greatest father of the Muhammedan church. It will thus be immediately obvious to what a vast extent Christian theory of the seventh and eighth centuries still remains operative upon Muhammedan thought throughout the world.