You don't want to understand.
The explanation:
People divides into two categories:
one category work righteousness and are guided. They responded to the word of God's messenger (Moses, Jesus, Mohammed or others in their time) ... this category: He gives to them more guidance, more faith and belief, and guide them to do more righteousness and in the Next Life will reward them in Paradise in heaven.
The other category: the hard-hearted: they do every evil act and transgression, and they did not respond to God's messenger, but they oppose him ... this category He will give them more money and position and they increase in their contumacy and tyranny and increase in sins, so He will punish them in Hell.
So God does not wrong anyone: He will not punish anyone more than he deserves according to his evil work and his idolatry and atheism; nor will God give him a reward less than he deserves according to his righteous acts.
This is about the hypocrites (those who pretend to be believers, but truly they are disbelievers) in the Quran 2: 14-16, which mean:
{ 14. And when they meet those who believe, they say: 'We believe [as do you believe]';
but when they are alone with their devils e,
they say: 'Surely, we are with you f;
we are –merely – mocking [the believers. g]'
15. God [Himself] does mock them [by postponing their punishment] h,
offering them [wealth] to let them wander on blindly with their arrogance. i
16. Such are they who exchange error instead of guidance j,
so their commerce does not prosper, neither are they guided k.
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e Who deceive and guide them to the disbelief and misguidance.
f i.e. we follow you in fact, and we are not with the believers.
g when we said to them: "We believe".
h And He does not hasten to bring it on them in this life of the World
i Like the blind who does not see the reality of things.
j Because they exchanged Paradise for Fire, and dignity for disgrace.
k To any heavenly religion, but they are bewildered and misguided.
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Moreover, God - be glorified - said in the Quran 19: 75-76, which means:
75. Say: "whosoever is in error d, [God] Most Gracious may increase his wealth.
Until when they see that which they were threatened with, whether it be punishment e [in the life of the World], or the Hour [of death],
they will know then who is worst in position [above the other party], and is weakest of host [: the believers or the disbelievers. f]"
76. Those who are guided g – God increases them in more guidance [according to their expenditure out of their wealth in the way of God]h, and even the righteous [deeds] that remain [to the Next Life] i are far better j with your Lord [O man] in respect of reward, and far better for [their] return to Us [in the Next Life.]
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d Away from the truth, and from following it.
e With disease, drought or inflictions.
f This is a threatening to them with the punishment.
g By the plain ayat of the Quran.
h i.e. because of their expenditure on the poor and the weak.
i i.e. the righteous work will remain preserved to them with God, until they will go to the ether world to find that before them.
j Than the wealth and ornament of the World is.
The interpretation is by Mohammed-Ali Hassan Al-Hilly.
That is because you barred the one who said: that he or she thought God is cruel (Glory be to God!), and you said to him: this is untrue.
The Next Life is logical and should be, or else everything in existence is purposeless and aimless, which is not correct; for we see there is wisdom behind every process and everything in existence.
Moreover, it is to fulfill justice among people: to judge for the wronged one against the wronging one, or else all the transgressor and the oppressed will be equal in outcome.
We see also many observations with phases: creation in the womb as fetus for 9 months, then delivery to the life of the World when man will live for his life span and grow from child, to young then to elderly then will die. So man has not been created to remain in the womb, as has he not been created to remain in the life of the World.
And in fact, the material world has been created to be as a mould for the Next Spiritual World, and man has been created for the Next Spiritual Everlasting Life.
The believer believes in God and in the Next Life following death, while the disbeliever does not believe in God and the Next Life.
So man, and particularly the disbeliever, try to evade the thinking about the Next Life, because there he will lose on account of his disbelief and much many sins and crimes.
The Next Life is spiritual not material, so it is not measured by kilograms of centimeters; it is deduced by logic and faith, in addition there are many logical proofs and manifestations about the Next Life.
E.g. many men died and then returned to life again and they described many things which they faced there.
And some people went to the Next Life and returned again, like Abu abd-Allah in his trip in the spirit world which lasted for about one hour, and like many other men.
http://www.quran-ayat.com/man/index.htm#A_Story_of_Fainting_
