Besides his recognition of the need of ritual, he was fully aware of the repugnance of most men to the wholly new. Whenever possible he emphasized his connection with the ancient ceremonies of Mecca in their purer form, and as soon as his power was sufficient, he enforced the recognition of his claims upon the city itself.
His achievement as religious reformer rests largely upon the state of preparation in which he found his medium, but it owes its efficiency to one force alone. Mahomet was possessed of one central idea, the indivisibility of God, and it was sufficient to uphold him against all calamities. The Kuran sounds the note of insistence which rings the clarion call of his message. With eloquence of mind and soul, with a repetition that is wearisome to the outsider, he forces that dominant truth into the hearts of his hearers. It cannot escape them, for he will not cease to remind them of their doom if they do not obey. What he set out to do for the religious life of Arabia he accomplished, chiefly because he concentrated the whole of his demands into one formula, "There is no God but God"; then when success had shown him the measure of his ascendancy, "There is no God but God, and Mahomet is His prophet."
At the end of his life idolatry was uprooted from his native country. The tribes might rebel against the heaviness of his political yoke, and were often held to him by the slenderest of diplomatic threads, but their monotheistic beliefs remained intact once Islam had gained the ascendancy over them. At the end of the Farewell Pilgrimage, he realised with one grand uplifting of his soul in thanksgiving that he had indeed caught up the errant attempts of Arabia to remodel its unsatisfying faith, and had made of them a triumphant reality, in which the conception of Allah's unity was the essential belief.
Besides his religious and political attainments, he gave to Arabia as a whole its first written social and moral code. Here the estimate of his accomplishment is difficult to render, bemuse comparison with the existing state is almost impossible. Extensively in the Kuran, but to a greater degree in the mass of his traditional sayings, crystallised into a standard edition by Al-Bokhari, when due allowance has been made for the additions and exaggerations of his followers, the chief characteristic is the casual nature of his laws.
All his dictates as to the control of marriage, the sale and tenure of land, commerce, plunder, as well as health and dietary are the result of definite cases coming within his adjudication. Such an idea as the deliberate compilation of a code never occurred to him, and there is no evidence that he ever referred to his former decisions in similar cases, so that possibilities of contradiction and evasion are limitless. Out of this jumble of inconsistencies Muslim law and practice has grown. He was enabled to impose his commands upon the conquered peoples by means of his military organisation, so that it was not long before Arabia was ruled in rough fashion by his social and moral precepts enforced by the sword. His wives offend him, and he forthwith sets down the duties and position of women in his temporal state. He desires the wife of his friend, and the result is a Kuranic decree sanctioning the taking of a woman under those conditions. He is jealous of his younger and more comely associates, and thereupon ordains the perpetual seclusion of women. He is annoyed at the untimely visits to his house of assembly, and so he commands that no Believer shall enter another's apartment uninvited. It is inconvenient to relinquish the watch night or day during the period of siege in Medina, therefore he institutes a system whereby half the army is to pray while the other half remains at its post. Instances may be multiplied without ceasing of this building up of a whole social code upon the most casual foundations. But unheeding as was its genesis, it was in the main effective for those times, and in any case it substituted definite laws for the measureless wastes of tradition and custom.
It is probable that Mahomet relied a great deal upon existing usages. He was too wise to disturb them unnecessarily. His was a nature of extremes combined with a wisdom that came as a revelation to his followers. Where he hates it is with a hurricane of wrath and destruction, where he loves it is with the same impetuous tenacity. His denunciations of the infidels, of his enemies among the Kureisch, of the laggards within his own city, of the defamers of holy things, of drunkards, of the unclean, of those who even copy the features of their kindred or picture their idea of God, are written in the most violent words, whose fury seems to smite upon the ear with the rushing of flame.
And so the prevailing stamp upon Muslim institutions is fanaticism and intolerance. As the Prophet drew up hard-and-fast rules, so his followers insisted upon their remorseless continuance. Mahomet found himself compelled to issue ordinances, often hurried and unreflecting, to meet immediate needs, to settle disputes whose prolongation would have meant his ruin. He possessed the qualities of poet, seer, and religious mystic, but these in his later life were overshadowed by the characteristics of lawgiver, soldier, and statesman demanded by his position as head of a body of men. But neither his mysticism nor his poetic feeling entirely desert him. They flash out at rare moments in the later suras of the Kuran, and are apparent in his actions and the traditional accounts of his sayings, while his creed remained steadfast and unassailable with a strength that neither defeat nor disaffection could shake. With all the incompleteness and often contradiction of his administration, he nevertheless was able to satisfy his followers as to its efficacy mainly by his exhaustless belief in himself and his work.
In military development his contribution was unique. He gathered together all the war-loving propensities of the Faithful, and wove them into a solidarity of aim. His personal courage was not great, but his strategy and above all his invincible confidence, which refused to admit defeat, were beyond question. Every leader he sent upon plundering or admonitory expeditions bore witness to his efficiency and his zeal. He subjected the Muslim to a discipline that brought out their best qualities of tenacity and daring. He would not allow his soldiery to become individual plunderers, but insisted that the booty should be equally divided. In the beginning he possessed few horsemen, but he rapidly produced a squadron of cavalry as soon as he became convinced of their usefulness. His readiness to accept advice as to the defence of Medina proved the salvation of the city. Under him the military prowess of Islam had ample scope, for he gave his leaders complete freedom of action; the result was visible in the supreme fighting quality of Ali, Omar, and Hamza, while the chances of achieving glory under his banner were the moving motives of the conversion of Khalid and Abbas. He subdued internecine warfare, and by a bold stroke united the warrior instincts of Arabia against external foes, laying upon them the sanction of religion and the promise of eternal happiness.
Though unskilled in the mechanism of knowledge—he could neither read nor write—he has left his mark upon the literature of his age and the years succeeding him. The Kuran was the sum of his inspiration, the expression in poetic and visionary language of his beliefs and ideals. He found the medium prepared. The Arabs had long previously evolved a poetry of their own which lived not in written words, but in their traditional songs. Mahomet's first flush of inspiration, which waned before the heaviness of his later tasks, is the cumulation of that wild and fervid art with the breath of the desert urgent within it.
The Kuran was never written down during his lifetime, but was collected into a jumble of fragments, "gathered together from date-leaves and tablets of white stone, and from the breasts of men," by Zeid in the first troublous years of the Caliphate. We have inevitably lost much of its original fire, and its effect is weakened by any translation into the unsuitable medium of modern speech. But that it is a valuable contribution to the literature of its country cannot be doubted, especially in the earlier portions, before Mahomet's love of harangue and the necessity of some vehicle by which to make his political dictates known had transformed its style into the bald reiterative medley of its later pages.