MA'AD (RESURRECTION)
Ma'ad is one of the three pillars of the holy religion of Islam and one of the essentials of this pure religion. Every man (without any exception) can tell the difference between good and evil deeds with his Allah-granted nature and considers "benevolence" (although he may not practise it) to be 'decent and essential act to perform and "evil deeds" (although he may be performing these) to be indecent and an act to essentially avoid. Undoubtedly, goodness and badness, benevolence and malevolence are from the viewpoint of the results and rewards which these two qualities possess. Likewise, there is no doubt that not even a single day exists in this world when the rewards and retribution of good and bad deeds of benefactors and malefactors do not reach them; for we clearly observe that many benefactors spend their lives in extreme bitterness and misery, whereas many malefactors who are fully involved in committing crimes and misdemeanours, with their wicked behaviour and disgraceful character, spend their lives with happiness and prosperity.
For this reason, if in the future and in a world other than this world, no day had been fixed when good and bad deeds would be judged and appropriate recompense would be given, such an attention and care (that benevolence is good and essential and malevolence is bad and to be avoided) would not have been placed in the nature of man.
It should not be imagined that the reward of benevolence, which the man considers good is this that it establishes order in the society and people gain prosperity in their lives and that consequently the benevolent person himself receives a portion of the benefits of his benevolence. In the like manner, it should also not be imagined that a malevolent person, with his indecent conduct and behaviour, disrupts the order of the society and thus he himself finally gets entangled with its unpleasant effects.
Although this kind of thinking is to some extent applicable to disorganised and inefficient individuals; it does not apply to those people who have reached the peak of power and whose happiness and success are not at all influenced by the order and disorder of the society, on the contrary when disturbance and corruption prevail in the society and when the living conditions of the people become gloomy, these individuals get happier and more successful, thus there re mains no reason for the nature of such people to consider benevolence as good and malevolence as bad.
In like manner, although these people are prosperous in their short lives, it should not be imagined that their names will be disgraceful and will bear the dislike of the public forever because of their wicked acts.
This is because the manifestation of their disgraceful names and the unpleasant judgement of the posterity about them occur at a time when these people have passed away and have no impact on their lives full of happiness, pleasure, and enjoyment.
On this account, there will be no reason for man to consider benevolence as good and to acquire it or to consider malevolence as bad and to refrain from it and tend towards the above-mentioned belief. Had there not been the Ma'ad, it would be a superstitious belief.
Therefore, through this pure and firm belief that the Creator of the world has placed in our nature, we should understand that the Almighty Allah will resurrect everyone after death and will look into their deeds. The Almighty Allah will give a good reward and an everlasting blessing to the benefactors for their deeds and will punish the malefactors for their deeds. And this day is called the Yawm al-Qiyamah (Day of Judgement).
http://www.al-shia.com/html/eng/books/beliefs/islamic-teachings-in-brief/22.htm