From Pope Benedict XVI's address at the University of Regensburg:
"[Byzantine emperor Manuel II Paleologus] turns to his interlocutor somewhat brusquely with the central question on the relationship between religion and violence in general, in these words: 'Show me just what Mohammed brought that was new, and there you will find things only evil and inhuman, such as his command to spread by the sword the faith he preached.' The emperor goes on to explain in detail the reasons why spreading the faith through violence is something unreasonable.... The decisive statement in this argument against violent conversion is this: Not to act in accordance with reason is contrary to God's nature. The editor, Theodore Khoury, observes: For the emperor, as a Byzantine shaped by Greek philosophy, this statement is self-evident. But for Muslim teaching, God is absolutely transcendent. His will is not bound up with any of our categories, even that of rationality."
From Pope Benedict XVI's apology:
"I am deeply sorry for the reactions in some countries to a few passages of my address at the University of Regensburg, which were considered offensive to the sensibility of Muslims. These in fact were a quotation from a medieval text, which do not in any way express my personal thought.... [T]he true meaning of my address ... in its totality was and is an invitation to frank and sincere dialogue, with great mutual respect."
* For the full text of the papal address: http://zenit.org/english/visualizza.phtml?sid=94748