Surah 21. Al-Anbiya, Ayah 111

Lit., "enjoyment [of life] for a while": i.e., a chance, mercifully granted by God, to attain to

In the same way if men who come into the Brotherhood from pure motives and yet feel aggrieved that those outside are better off from a worldly point of view, they are wrong. It may be that the fleeting enjoyment of this world's goods is but a trial, and they should be grateful for being saved from temptation.