A SATISFACTORY EXPLANATION
If we go by the theory of cause and effect, is it possible that this entire world could just have been created in vain — with no purpose whatsoever?

Look at the sun, the moon or the tiniest insect — is it conceivable that they could all have been created without any specific purpose?

In fact, to my mind everything appears to have been created for a specific purpose. Even human desires appear to have been created for a purpose. However, this purpose cannot be fulfilled in this present limited world. Since these desires are unlimited, they can only be fulfilled in an unlimited world, i.e. in Paradise. 

This brings us to the question — what is Paradise? Paradise is the ultimate answer to the human quest. It is a vast, zero-defect, evil-free universe, complete in itself.

Certainty prevails all over the universe, but the human world is marred by uncertainty. Fear is unheard of in the universe, but man continually suffers from fear and apprehension. The rest of the universe is in a state of equilibrium as it receives everything that it needs, while human beings are in a state of imbalance as they are the only creatures in the world to suffer from the painful thought that they have not received what they wanted. Moreover, the rest of the universe is evil-free, while human beings continually suffer from the problem of evil due to the misuse of freedom by others.

Paradise is the answer to all these problems. The concept of Paradise shows that man too will find everything that the rest of the universe has found. So while the rest of the universe is receiving what it wants today in this world itself, man will receive what he wants tomorrow in Paradise.