Thomas Carlyle, the Scottish historian said:
"They call him a prophet, you say? Why, he stood there face to face with them, here, not enshrined in any mystery, visibly clouting his own cloak, cobbling his own shoes, fighting, counseling, ordering in the midst of them. They must have seen what kind of a man he was, let him be called what ye like. No emperor with his tiaras was obeyed as this man in a cloak of his own clouting. During three and twenty years of rough, actual trial, I find something of a veritable hero necessary for that of itself. "

Reverend Professor William Montgomery Watt said:
His readiness to undergo persecution for his beliefs, the high moral character of the men who believed in him and looked up to him as a leader, and the greatness of his ultimate achievement - all argue his fundamental integrity. To suppose Muhammad as an impostor raises more problems than it solves. Moreover, none of the great figures of history is so poorly appreciated in the West as Muhammad ... Thus, not merely must we credit Muhammad with essential honesty and integrity of purpose, if we are to understand him at all; if we are to correct the errors we have inherited from the past, we must not forget the conclusive proof is a much stricter requirement than a show of plausibility, and in a matter such as this only to be attained with difficulty.

Reverend Bosworth Smith said:
"If ever a man ruled by a divine right, it was Muhammad, for he had all the powers without their supports. He cared not for the dressings of power. The simplicity of his private life was in keeping with his public life" .

Washington Irving said:
" His military triumphs awakened no pride nor vain glory as they would have done had they been effected by selfish purposes. In the time of his greatest power he maintained the same simplicity of manner and appearance as in the days of adversity. So far from affecting regal state, he was displeased if, on entering a room, any unusual testimonial of respect was shown to him" .

Wolfgang Goethe, the German Poet said: "I looked into history for a human paradigm and found it to be in Muhammad".