[2:201] Others would say, “Our Lord, grant us righteousness in this world, and righteousness in the Hereafter, and spare us the retribution of Hell.”
[2:202] Each of these will receive the share they have earned. GOD is most efficient in reckoning.
Marshmallow Experiment
https://www.youtube.com/watch?v=EHOeYgO_2tE
The Marshmallow Test and Why We Want Instant Gratification: Silvia Barcellos at TEDxMidAtlantic 2012
https://www.youtube.com/watch?v=voF8B-Jr0mA
Marshmallows and Children a Lesson in Time Preference Theory (Ted)
https://www.youtube.com/watch?v=M0yhHKWUa0g
Ask God for this life then He will give you the marshmallow now. But, if you ask for the Hereafter then God will give you the marshmallow now and in the Hereafter as well.
Quran Talk Blog 