Surah 43. Az-Zukhruf, Ayah 33

Since "man has been created weak" ( 4:28 ), it is almost a "law of nature" that whenever he is exposed to the prospect of great wealth he is liable to lose sight of all spiritual and moral considerations, and to become utterly selfish, greedy and ruthless.

So little value is attached in the spiritual world to silver or gold, or worldly ranks or adornments, that they would freely be at the disposal of everyone who denied or blasphemed Allah, were it not that in that case there would be too great temptation placed in the way of men, for they might all scramble to sell their spiritual life for wealth! They might have silver roofs and stair-ways, silver doors and thrones, and all kinds of adornments of gold. But Allah does not allow too great a temptation to be placed in the path of men. He distributes these things differently, some to unjust men, and some to just men, in various degrees, so that the possession of these is no test either of an unjust or a just life. His wisdom searches out motives far more subtle and delicate than any we are even aware of.