The purpose of Man's existence in the worldly life:

Dear brothers, if our creation was without any purpose- the purpose is of course confirmed in the Quran- then why were we created? Why are we here in the worldly life? Do we have a mission we are suppose to accomplish? If we have a mission to accomplish, then what is it? What is the goal that we should seek so that we won't be regretful, disappointed and losers on the Day of Resurrection? Were we created in order to accumulate money and pass it on to our children so that they can waste it in a short period of time? Well, money alone does not please man. Not to mention that its owner, if he is not enlightened or guided, is likely to deviate and tell lies…

Were we created then only to get certificates, hang them up on walls, brag about them and make use of them to the fullest financially speaking? We see how those scientific certificates cannot stop their owners from committing sins. Let alone, that they do not elevate inferior souls, nor do they purify them from their evil whims. Although scientific certificates are not the main purpose of our existence, as believers we are ordered to be educated because education is the strongest weapon nowadays. 

Were we created to indulge ourselves in desires completely? In fact indulging in desires grants a temporary happiness that does not guarantee the everlasting one for man. Besides, man's ability to enjoy tangible things is limited; youth does not last forever, health deteriorates gradually and money is to be spent. Why were we created, then? We were created in order to know our Creator, and so be happy when we know Him, in order to get closer to Him and so be blessed with that closeness and in order to make the worldly life as a vehicle to the Hereafter

The Prophet, peace be upon him, said:

((He is not one of the good people whoever among you disgraces the worldly life for the sake of the Hereafter, or whoever disgraced the Hereafter for the sake of the worldly life unless he takes some of his sustenance from them both as the first is a vehicle that leads you to the second.))