Gregory Palamus of Thessalonica on Islam

"For these impious people, hated by God and infamous, boast of having got the better of the Romans by their love of God...they live by the bow, the sword and debauchery, finding pleasure in taking slaves, devoting themselves to murder, pillage, spoil and not only do they commit these crimes, but even - what an aberration - they believe that God approves of them. This is what I think of them, now that I know precisely about their way of life."