By Allah's will, people caught up in the false face of the world are not just recompensed for their errors in the Hereafter but during the life of this world also. Even the wealthiest or seemingly most knowledgeable person in the world will generally find no happiness in these attributes if he or she fails to live by the moral values of the Qur'an. On account of their denial, Allah fills the hearts of such people with unease, spiritual discomfort and restlessness. Although they live surrounded by blessings which appeal to their earthly desires they still take no real pleasure in them. No matter how happy and content they may appear, this is generally deceptive.
The unease experienced by unbelievers spreads into every area of their lives. Their failure to appreciate the might of Allah, to think about destiny and look on events with a positive eye, and to exhibit proper moral values all guarantee trouble for them. Moreover, since they are unable to understand how the moral values of the Qur'an offer the individual a perfect and peaceful life, they imagine that everyone in the world suffers just the same troubles as they do. Yet those troubles in fact stem entirely from their own imperfections. Allah has revealed in the Qur'an that on account of their denial, there is suffering for those who turn aside from the true path, in this world and the next:
... Anyone misguided by Allah has no guide. They will receive punishment in the life of this world and the punishment of the Hereafter is harsher still. They have no defender against Allah. (Surat ar-Ra'd, 33-34)
When we examine various aspects of the lives of unbelievers, the unhappiness which encompasses such people is clear to see. We can see how all-encompassing and influential this trouble is. Some peoples' greatest dream from childhood is to make a lot of money, become rich and spend that money howsoever they choose. This is so important to them that they will make any sacrifice to achieve that end. When their student years come to an end and they begin to find themselves undertaking serious responsibilities, they imagine that they are now in a position to deal with the difficulties life may confront them with.
Since they fail to consider that it is Allah Who gives human beings their daily bread and Who grants blessings and takes them away as He wishes, they wear themselves out in order to achieve such transitory benefits as wealth or position. They are essentially defeated by their own worldview. Much of the time, they are forced to give up things they love as they strive for this end which they believe will bring happiness and contentment. They may eventually attain the enjoyment of this world at the end of this chase for glory, through so much difficulty and trouble. Yet the outcome is again no different. In addition to all the trouble they experience in attaining their desires, they also begin to feel uneasy out of a fear of losing them. They have no idea how to be happy with what they have and make do with those blessings in their possession. They constantly complain about the situation they are in and lament over the things they do not possess. Even the sight of someone wealthier, more cultured, more talented or apparently better looking than themselves is sufficient to undermine their morale.
They make great efforts not to allow their state of mind to show. They seek distraction and amusement and to free their souls from trouble in a variety of activities. They may indeed sometimes achieve happiness on a temporary and superficial level. At such times, they are happy on the surface; yet this is not a permanent happiness. They feel massive doubt and fear yet they are so careful not to show this to the world. Indeed, even if they forget their woes for a time, they can at any moment fall victim once again to despair, pessimism and sorrow because they do not submit themselves to Allah. When a jovial businessman suddenly remembers his debts; or a student regrets his poor marks; or the elderly look back on their lost youth; or the bereaved recall happy times they spent with their deceased friends-these thoughts can give rise to sorrow and numbness. And it is similarly sobering for any of them when they realize that death, the inevitable end, is approaching.
Whether these people are rich or poor, old or young, attractive or ugly makes no difference. Someone obliged to labor under difficult conditions from morning to night is in exactly the same position as another person who enjoys total well-being and has no need to assume any responsibilities at all. They constantly experience the difficulty of being unable to enjoy true interest, concern, love and affection from those around them. Since they imagine that the tasks they perform regularly every day and the responsibilities they bear will never come to an end, they feel a great weariness in their bodies, minds and hearts. They are indeed aware of how monotonous and meaningless their lives are and their inability to find a solution is a cause of major restlessness. 
So long as they fail to believe in Allah, people in that position can never escape their doubts and troubles. They unequivocally fail to seek shelter in Allah. They do not abide by the road He has set out. They seek to adapt themselves to the lives they lead and regard troubles and difficulties as normal parts of life.
In truth, Allah is punishing the unbelievers for their deeds with all these troubles they experience while they are still alive. Since they ignore the life of the Hereafter, their true life, and turn to the false things of this world, the sufferings of this world are never-ending for them.
As revealed in the Qur'an: "So Allah made them taste disgrace in the life of this world and the punishment of the Hereafter is far worse if they only knew." (Surat az-Zumar, 26)
Even greater suffering awaits them in the Afterlife. They will realize the truth of the Hereafter but having ignored it in this world, it will be of no use to them whatsoever. They will be recompensed with the curse and torment of Allah for their deeds:
The Companions of the Garden will call out to the Companions of the Fire: "We have found that what our Lord promised us is true. Have you found that what your Lord promised you is true?" They will say: "Yes, we have!" Between them a herald will proclaim: "May the curse of Allah be on the wrongdoers, those who bar access to the way of Allah, seeking in it something crooked, and reject the Hereafter." (Surat al-A'raf, 44-45)
