George Bernard Shaw said:
I have always held the religion of Muhammad in high estimation because of its wonderful vitality. It is the only religion which appears to possess that assimilating capability to the changing phases of existence which make itself appeal to every age - I have prophesized about the faith of Muhammad that it would be acceptable tomorrow as it is beginning to be acceptable to the Europe of today. Medieval ecclesiastics, either through ignorance or bigotry, painted Muhammadanism in the darkest colours. They were, in fact, trained to hate both the man Muhammad and his religion. To them, Muhammad was an anti-Christ. I have studied him, the wonderful man, and in my opinion, far from being an anti-Christ, he must be called the Saviour of humanity.

Professor Keith Moore said:
It is clear to me that these statements must have come to Muhammad from God, or Allah, because most of this knowledge was not discovered until many centuries later. This proves to me that Muhammad must have been a messenger of God, or Allah.

Annie Besant said:
It is impossible for anyone who studies the life and character of the great Prophet of Arabia, who knew how he taught and how he lived, to feel anything but reverence for the mighty Prophet, one of the great messengers of the Supreme. And although in what I put to you I shall say many things which may be familiar to many, yet I myself feel, whenever I reread them, a new way of admiration, a new sense of reverence for that mighty Arabian teacher.

Dr. Gustav Weil said:
Muhammad was a shining example to his people. His character was pure and stainless. His house, his dress, his food - they were characterized by a rare simplicity. So unpretentious was he that he would receive from his companions no special mark of reverence, nor would he accept any service from his slave which he could do for himself. He was accessible to all at all times. He visited the sick and was full of sympathy for all. Unlimited was his benevolence and generosity as also was his anxious care for the welfare of the community.

Edmund Burke said:
The Muhammadan law, which is binding on all from the crowned head to the meanest subject, is a law interwoven with a system of the wisest, the most learned and the most enlightened jurisprudence that ever existed in the world.