Disbelievers will experience an everlasting and extremely severe punishment. Those who will pass away as Believers are now at ease, and they are experiencing inner happiness. As for disbelievers, they are afraid of the prospects of burning in fire eternally.
O, human beings, think carefully! After a few years, you will be one of them. At that time, all of your life, activities and painstaking efforts will be an image or dream, as is the case with the years that have passed. Therefore, which party do you want to belong in? You cannot say that you do not want to belong to neither party. This is impossible. You will be among either one at any rate. Even if it is merely a probability, do you want to be burned eternally in a fire?
Wisdom, knowledge, and science prevent the rejection of the existence of Allah and a belief regarding Paradise and Hell. Objective individuals are unable to assert that such things cannot happen. Those who do not believe are unable to show any documents or evidence supporting their rejection. However, the evidences that prove belief to be unavoidable is innumerable. World libraries are full of books which spell out these proofs. Deceived by their nafs  and pleasures, they reject. They think of nothing except their pleasures. However, Islam does not prohibit pleasure itself. It prohibits the hazardous effects of certain pleasures.
Therefore, the one who has wisdom obtains his pleasure through the means shown by Allahu ta’ala. He is adorned with the superior morality of Islam. He is helpful to everyone. He retaliates with goodness to those who act maliciously towards him. If he is unable to be benevolent at least, he should act with patience. He should not be destructive; he should be constructive. Thus, he will attain his pleasures, comfort and peace of mind. Besides, he will be spared the eternal torments of the next world.
It is a proven fact that to be a Muslim and to have iman (belief) are prerequisite for peace of mind and happiness. To have iman is very easy. It is not necessary to give money to a certain place, to give goods, to do hard work, to receive permission from someone. Additionally, it is not necessary to declare it openly and to inform someone about your iman. Iman consists of learning six things and believing in them through the heart in a secret way. The one who has iman becomes submissive to Allahu ta’ala’s commandments. In other words, he willingly practices without any compulsion. Thus, he becomes a Muslim.
 nafs: a force in man which wants him to harm himself religiously; an-nafs al-ammara. A negative force within man prompting him to do evil. (Nafs-i ammara). Nafs is ammara by creation, that is, it always wishes evil and harmful deeds to be done. It is reluctant to obey the Shari’at. The nafs of a man who obeys the Shari’at and makes progress in the way of tasawwuf becomes mutmainna. It wishes to obey the Shari’at.