In the words of Professor Hurgronje:

The league of nations founded by the prophet of Islam put the principle of international unity and human brotherhood on such universal foundations as to show candle to other nations. He continues, the fact is that no nation of the world can show a parallel to what Islam has done towards the realization of the idea of the League of Nations.
Edward Gibbon and Simon Ockley, on the profession of ISLAM, writes in History of the Saracen Empires:

I BELIEVE IN ONE GOD, AND MAHOMET, AN APOSTLE OF GOD' is the simple and invariable profession of Islam. The intellectual image of the Deity has never been degraded by any visible idol; the honor of the Prophet have never transgressed the measure of human virtues; and his living precepts have restrained the gratitude of his disciples within the bounds of reason and religion.
[History of the Saracen Empires, London, 1870, p. 54]


EWolfgang Goethe, perhaps the greatest European poet ever, wrote about Prophet Muhammad, peace and blessings be upon him. He said:

He is a prophet and not a poet and therefore his Koran is to be seen as Divine Law and not as a book of a human being, made for education or entertainment.
[Noten und Abhandlungen zum Weststlichen Dvan, WA I, 7, 32]