Chasidut su Esodo 33:15

But it appears that [it is because] the world was created with the joining of the attribute of mercy to the attribute of strict judgement. Hence His wisdom, may His name be blessed, decreed that the reward for [fulfilling] a commandment not be paid in this world under any circumstance, so that one’s reward for [fulfilling] commandments be saved for him in its entirety for the world to come. And that which the Holy One, blessed be He, has goodness flow upon a man in this world is [only] from the angle of kindness; and it is a gift that He gives to him. And perhaps this is the meaning of that which the Holy One, blessed be He, said to Moshe (Exodus 33:15), “I will make all My goodness pass over you” – its understanding is that all of the reward for [fulfillment of] commandments will be preserved and saved for the world to come; but in this world, He will have [that] reward pass over him, such that ‘there is none in this world.’ And that [good] which He has flow in this world is a free gift – and that is the meaning of “and the grace that I grant.” And that is from that which “I will proclaim before you the name, Lord” – that is the trait of mercy (traditionally associated with that name) that the Lord, may He be blessed, uses in this world. And according to that which the Sages, may their memory be blessed, said (Berakhot 7a) that the question of Moshe, peace be upon him, was why is there a righteous person that has bad occur to him – the Holy One, blessed be He, answered that it is because I give a free present to the completely righteous, to the one that I can give [a full] reward in the next world (as he has no sins that require a deduction from the full reward). But regarding one who is not completely righteous, it is mercy if I punish him a little in this world, in order that I can have mercy upon him (and give him a full reward) in the world to come.