Be certain of this, that the highest aim of creation and its most important result is belief in God.
The most exalted rank in humanity and its highest degree is the knowledge of God contained within belief in God. The most radiant happiness and sweetest bounty for jinn and human beings is the love of God contained within the knowledge of God.
And the purest joy for the human spirit and the sheerest delight for man’s heart is the rapture of the spirit contained within the love of God. Yes, all true happiness, pure joy, sweet bounties, and untroubled pleasure lie in knowledge of God and love of God; they cannot exist without them.
The person who knows and loves God Almighty may receive endless bounties, happiness, lights, and mysteries. While the one who does not truly know and love him is afflicted spiritually and materially by endless misery, pain, and fears. Even if such an impotent, miserable person owned the whole world, it would be worth nothing for him, for it would seem to him that he was living a fruitless life among the vagrant human race in a wretched world without owner or protector.
Everyone may understand just how forlorn and baffled is man among the aimless human race in this bewildering fleeting world if he does not know his Owner if he does not discover his Master. But if he does discover and know Him, he will seek refuge in His mercy and will rely on His power. The desolate world will turn into a place of recreation and pleasure, it will become a place of trade for the hereafter.
From The Twentieth Letter by Master Said Nursi