It appears that Mohammed was remarkable for mental endowments, even in his youth, for, in a religious conversation with a Nestorian monk, at Basra, he showed such knowledge and talent, that the monk remarked to his uncle, that great things might be expected of him. He was, however, attentive to business, and so completely obtained the confidence of his uncle, as a merchant, that he was recommended as a prudent and faithful young man, to Khadijah, a rich widow, who stood in need of an agent to transact her business and manage her affairs. In this capacity he was received, and so well did he discharge his duties, that he not only won the confidence of the widow, but finally obtained her hand in marriage. This event took place when he was about twenty-five years old, Khadijah being almost forty. Mohammed was now rich, and, though he continued to carry on mercantile business, he often retired to a cave, called Heva, near Mecca, where he resided. He also performed several journeys to different parts of Arabia and Syria, taking particular pains to gather religious information, especially of learned Jews and Christians. For some time, Mohammed, who lived happily with his wife, confided to her his visits to the cave Heva, professing to enjoy interviews with Heaven there, by means of dreams and trances, in which he met and conversed with the angel Gabriel. There is little doubt that his habits of religious retirement and gloomy reflection had unsettled his judgment, and that he now gave himself up to the guidance of an overwrought fancy. It is probable, therefore, that he believed these visions to be of divine inspiration; else, why should he first communicate them, as realities, to his wife? Soon after this, he informed other members of his family of his visions, and, being now about forty years old, assumed with them, the character and profession of a prophet. Several of his friends, particularly his wife, and his cousin Ali, a young man of great energy of character, yielded to the evidence he gave of his divine mission. Having been silently occupied about three years in converting his nearest friends, he invited some of the most illustrious men of the family of Hashem to his house, and, after conjuring them to abandon their idolatry, for the worship of ONE GOD, he openly proclaimed his calling, and set forth, that, by the commands of Heaven, revealed through the angel Gabriel, he was prepared to impart to his countrymen the most precious gift—the only means of future salvation.