" Fixed settlements were perhaps inevitable, but they were dangerous. Their ancestors' way of life had been the nobler one, the life of tent-dwellers, often on the move. Nobility and freedom were inseparable, and the nomad was free. In the desert a man was concious of being the lord of the space, and in virtue of that lordship he escaped in a sense from the domination of time. By striking camp he sloughed off his yesterdays; and tomorrow seemed less of a fatality if its where as well as its when had yet to come. But the townsman was a prisoner; and to be fixed in one place, - yesterday, today, tomorrow - was to be a target of time, the ruiner of all things. Towns were places of corruption. Sloth and slovenliness lurked in the shadow of their walls, ready to take an edge off a man's alertness and vigilance. Everything decayed there, even language, one of man's most precious possessions.    "

― , Muhammad: His Life Based on the Earliest Sources