Origin...

On account of their savage nature, the Arabs (muslims) are people who plunder and cause damage. They plunder whatever they are able to lay their hands on without having to fight or to expose themselves to danger. They then retreat to their pastures in the desert. …Every stronghold or locality that seems difficult to attack. they bypass in favour of some less difficult 'enterprise'. Tribes that are protected against the Arabs (muslims) by inaccessible mountains are safe from their mischief and destructiveness. The Arabs would not cross hills or undergo hardship and danger in order to get to them.

Flat territory, on the other hand, falls victim to their looting and prey to their appetite whenever they have the opportunity of gaining power over it. Then they raid, plunder, and attack that territory repeatedly, because it is easily accessible to them. Eventually, its inhabitants succumb utterly to the muslims and then they are pushed around by them. Eventually, their civilization is wiped out.

Places that succumb to muslims are quickly ruined...

The reason for this is that the Arabs (muslims) are a savage nation, fully accustomed to savagery and the things that cause it. Savagery has become their character and nature. They enjoy it, because it means freedom from authority and no subservience to leadership. Such a natural disposition is the negation and antithesis of civilization. For instance, the Arabs need stones to set them up as supports for their cooking pots. So, they take them from buildings which they tear down to get the stones, and use them for that purpose. Wood, too, is needed by them for props for their tents and for use as tent poles for their dwell­ings. So, they tear down roofs to get the wood for that purpose. The very nature of their existence is the negation of building, which is the basis of civilization.

Furthermore, it is their nature to plunder whatever other people possess. Their sustenance lies wherever the shadow of their swords falls. They recognize no limit in taking the possessions of other people. Whenever their eyes fall upon some property, furnishings, or utensils, they take it. When they acquire superiority and royal authority, they have complete power to plunder as they please. There no longer exists any political power to protect property, and civilization is ruined.

Since they use force to make craftsmen and professional workers do their work, they do not see any value in it and do not pay them for it. The sedentary population disperses, and civilization decays.”

The Arabs (muslims) are not concerned with laws. They care only for the property that they might take away from people through looting and imposts. When they have obtained that, they have no interest in anything further. For this reason, greater fortitude is found among the savage Arab Bedouins than among people who are subject to laws. Those who rely on laws and are dominated by them from the very beginning of their education and instruction in the crafts, sciences, and religious matters, are thereby deprived of much of their own fortitude.

Under the rule of the Arabs (muslims), the subjects live as in a state of anarchy, without law. Anarchy destroys mankind and ruins civilization,

Furthermore, every Arab (muslim) is eager to be the leader. Scarcely any one of them would cede his power to another, even to his father, his brother, or the eldest most important member of his family… Civilization, thus, decays and is wiped out.

It is noteworthy how civilization always collapsed in places the Arabs (muslims) took over and conquered, and how such settlements were depopulated and the very earth there turned into something that was no longer earth. The Yemen where the Arabs live, is in ruins, except for a few cities. Persian civilization in the Arab Iraq is likewise completely ruined. The same applies to contemporary Syria.

Every Arab (muslim) who is attracted to city life quickly shows himself unable to compete and is disgraced... Link