The purpose of man's existence:

Dear brothers, most people do not know why they were created, do not look into the purpose of creating them (by Allah), do not look into the purpose of their existence in the worldly life or do not know their mission in the worldly life..

They also have a philosophy in life that is manifested in their behavior, whether they declare it or not; they believe that this worldly life is everything, and that there is nothing but this life. Allah says:

((They know only the outside appearance of the life of the world (i.e. the matters of their livelihood, like irrigating or sowing or reaping, etc.), and they are heedless of the Hereafter.))

(Ar-Rum: 7)

Because of this belief you find them racing for collecting money by legitimate and illegitimate ways, and they don't care whether this money is Haram or Halal. They do this in order to fulfill their sensual pleasures and live in luxury as long as they can reach it. However, you can notice that those who forgot their Lord and the Last Day are not happy in their life as they thought they would be. The reason is that none can have a perfect life; if someone is wealthy, he might be deprived of good health, and if he has good health, he might be deprived of tranquility. The Prophet, peace be upon him, said:

((O people, this worldly life is a place of crookedness and is not a place of straightforwardness. It is a place of grief and is not a place of joy.))

Let us say that life starts to be as someone wants it, but this happens after a great deal of effort and striving. Such a person loses his youth while trying to have a perfect life; he collects huge amounts of money only to spend them shortly, and as soon as he reaps the fruits of his effort, the angel of death comes and takes away in a second everything he exhausts himself to have throughout his life. He never relaxes or is at ease in his life (because he is always working for the worldly life). Yet, the angel of death comes unexpectedly and deprives him of everything he owns at once. At that moment he will not be ready for the eternal life (the Hereafter) as he does not live steadfastly in the worldly life nor does he perform a good deed with which he can meet Allah. Allah says:

((He will say: "Alas! Would that I had sent forth (good deeds) for (this) my life!"))

God says:

"Did you think that We had created you in play (without any purpose),