"The more one reflects on the history of Muhammad and of early Islam, the more one is amazed at the vastness of his achievement. Circumstances presented him with an opportunity such as few men have had, but the man was fully matched with the hour. Had it not been for his gifts as seer, statesman, and administrator and, behind these, his trust in God and firm belief that God had sent him, a notable chapter in the history of mankind would have remained unwritten. ...Only a profound belief in himself and his mission explains Muhammad's readiness to endure hardship and persecution during the Meccan period when from a secular point of view there was no prospect of success. Without sincerity how could he have won the allegiance and even devotion of men of strong and upright character like Abu-Bakr and 'Umar ? For the theist there is the further question how God could have allowed a great religion like Islam to develop on a basis of lies and deceit. There is thus a strong case for holding that Muhammad was sincere. If in some respects he was mistaken, his mistakes were not due to deliberate lying or imposture."