The sciences of only one nation, the Greeks, have come down to us, because they were translated through Al-Ma'mun's efforts. He was successful in thi… - Ibn Khaldun

It should be known that at the beginning of a dynasty, taxation yields a large revenue from small assessments. At the end of the dynasty, taxation yields a small revenue from large assessments.

On account of their savage nature, the Bedouins 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. They do not attack or fight except in self-defence. Every stronghold or (locality) that seems difficult to attack, they by-pass in favour of some less difficult (enterprise). Tribes that are protected by inaccessible mountains are safe from their mischief and destructiveness. The Bedouins 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 Bedouins and then are pushed around by them in accordance with changes of control and shifts in leadership. Eventually, their civilization is wiped out. God has power over His creatures.

Indeed, you should not desire to weigh with the intellect the issues of Tawhīd and the Hereafter; the reality of Prophethood; the reality of divine attributes and every other thing beyond the scope of the intellect, for such a desire is futile. An example of this would be a man who has a scale used for weighing gold suddenly desiring to weigh mountains with it! This does not mean that the scale is wrong in its measures; rather, the intellect has a limit it cannot surpass and a boundary it cannot transcend.