Alphonse de LaMartaine in 'Historie de la Turquie,' Paris, 1854.
" Never has a man undertaken a work so far beyond human power with so feeble means, for he (Muhammad) had in the conception as well as in the execution of such a great design, no other instrument than himself and no other aid except a handful of men living in a corner of the desert. Finally, never has a man accomplished such a huge and lasting revolution in the world, because in less than two centuries after its appearance, Islam, in faith and in arms, reigned over the whole of Arabia, and conquered, in God's name, Persia Khorasan, Transoxania, Western India, Syria, Egypt, Abyssinia, all the known continent of Northern Africa, numerous islands of the Mediterranean Sea, Spain, and part of Gaul.
"If greatness of purpose, smallness of means, and astonishing results are the three criteria of a human genius, who could dare compare any great man in history with Muhammad? The most famous men created arms, laws, and empires only. They founded, if anything at all, no more than material powers which often crumbled away before their eyes. This man moved not only armies, legislations, empires, peoples, dynasties, but millions of men in one-third of the then inhabited world; and more than that, he moved the altars, the gods, the religions, the ideas, the beliefs and the souls.”
"Philosopher, Orator, Apostle, Legislator, Conqueror of Ideas, Restorer of Rational beliefs.... The founder of twenty terrestrial empires and of one spiritual empire that is Muhammad. As regards all standards by which human greatness may be measured, we may well ask, is there any man greater than he?"
Sir George Bernard Shaw in 'The Genuine Islam,' Vol. 1, No. 8, 1936.
"If any religion had the chance of ruling over England, nay Europe within the next hundred years, it could be Islam."
“I have always held the religion of Muhammad in high estimation because of its wonderful vitality. It is the only religion, which appears to me to possess that assimilating capacity to the changing phase of existence, which can make itself appeal to every age. I have studied him - the wonderful man and in my opinion for from being an anti-Christ, he must be called the Saviour of Humanity."
"I believe that if a man like him were to assume the dictatorship of the modern world he would succeed in solving its problems in a way that would bring it the much needed peace and happiness: I have prophesied about the faith of Muhammad that it would be acceptable to the Europe of tomorrow as it is beginning to be acceptable to the Europe of today.”
Michael Hart in 'The 100, A Ranking of the Most Influential Persons In History,' New York, 1978.
My choice of Muhammad to lead the list of the world’s most influential persons may surprise some readers and may be questioned by others, but he was the only man in history who was supremely successful on both the secular and religious level. ...It is probable that the relative influence of Muhammad on Islam has been larger than the combined influence of Jesus Christ and St. Paul on Christianity. ...It is this unparalleled combination of secular and religious influence, which I feel, entitles Muhammad to be considered the most influential single figure in human history.