Surah 70. Al-Ma'arij, Ayah 2

In view of the fact that many of "those who deny the truth" - and, by implication, do evil in consequence of that deliberate denial - prosper in this world, a doubter might well ask whether or when this state of affairs will really be reversed and the values adjusted in accord with divine justice. An answer to the "whether" is given in the second paragraph of verse {2}; and to the "when", elliptically, at the end of verse {4}.