COMMENTARY on 40:17
A. Yusuf Ali:

Translation:
That Day will every soul be requited for what it earned; no injustice will there be that Day, for Allah is Swift 4380 in taking account.
Commentary:

4380  Swift in several senses: (1) the time of the present life or of the interval before Judgement, i.e., before the restoration of true values, is so short as compared to Eternity, that it may be counted as negligible: in the next verse the Day is characterised as "(ever) drawing near"; (2) in spite of the great concourse of souls to be judged, the process of Judgement will be almost instantaneous, "in the twinkling of an eye" (16:77), because everything is already known to Allah; and yet not the least injustice will be done.