During the next fifteen years of his life Muḥammad was externally a prosperous citizen, only distinguished from those around him by an habitual expression of thoughtful melancholy. What was passing in his mind may be conjectured with some probability from his first utterances when he came forward as a preacher. It is certain, and he himself has acknowledged, that he formerly shared the idolatry of his countrymen. "_Did not He find thee astray and lead thee aright?_" (Kor. xciii, 7). When and how did the process of conversion begin? These questions cannot be answered, but it is natural to suppose that the all-important result, on which Muḥammad's biographers concentrate their attention, was preceded by a long period of ferment and immaturity. The idea of monotheism was represented in Arabia by the Jews, who were particularly numerous in the Ḥijáz, and by several gnostic sects of an ascetic character--_e.g._, the Ṣábians[283] and the Rakúsians. Furthermore, "Islamic tradition knows of a number of religious thinkers before Muḥammad who are described as Ḥanífs,"[284] and of whom the best known are Waraqa b. Nawfal of Quraysh; Zayd b. ‘Amr b. Nufayl, also of Quraysh; and Umayya b. Abi ’l-Ṣalt of Thaqíf. They formed no sect, as Sprenger imagined; and more recent research has demonstrated the baselessness of the same scholar's theory that there was in Pre-islamic times a widely-spread religious movement which Muḥammad organised, directed, and employed for his own ends. His Arabian precursors, if they may be so called, were merely a few isolated individuals. We are told by Ibn Isḥáq that Waraqa and Zayd, together with two other Qurayshites, rejected idolatry and left their homes in order to seek the true religion of Abraham, but whereas Waraqa is said to have become a Christian, Zayd remained a pious dissenter unattached either to Christianity or to Judaism; he abstained from idol-worship, from eating that which had died of itself, from blood, and from the flesh of animals offered in sacrifice to idols; he condemned the barbarous custom of burying female infants alive, and said, "I worship the Lord of Abraham."[285] As regards Umayya b. Abi ’l-Ṣalt, according to the notice of him in the _Aghání_, he had inspected and read the Holy Scriptures; he wore sackcloth as a mark of devotion, held wine to be unlawful, was inclined to disbelieve in idols, and earnestly sought the true religion. It is said that he hoped to be sent as a prophet to the Arabs, and therefore when Muḥammad appeared he envied and bitterly opposed him.[286] Umayya's verses, some of which have been translated in a former chapter,[287] are chiefly on religious topics, and show many points of resemblance with the doctrines set forth in the early Súras of the Koran. With one exception, all the Ḥanífs whose names are recorded belonged to the Ḥijáz and the west of the Arabian peninsula. No doubt Muḥammad, with whom most of them were contemporary, came under their