World is created for what?

Imam ‘Ali (a.s.) said:
اَلدُّنْيا خُلِقَتْ لِغَيْرِها وَ لَمْ تُخْلَقْ لِنَفْسِها

Translation
World is created for another purpose, not for itself. 1

Brief Description
People sometimes have difficulty comprehending the nature of this world. They find one set of interpretations of verses and speeches commending the world and its material tools, introducing it as a house of commerce or farm of saints. And then they find verses and speeches blaming it and calling it dangerous, deceptive and source of conceit.
The above tradition clarifies the issue succinctly indicating that when the world and its material tools are used as a means of attaining human development and justice and prosperity for all, it is to be valued and commended. But when it is considered as an end in itself, just for immediate and inordinate fulfillment of desires, with no higher purpose, and causes rebellion, conceit and obstinacy, it becomes hateful and dangerous.[divider]
•    1. Safinat’ul-Bihar, Bihar Al-Anwar vol70, page 133, Sharh Nahj Albalagha, vol 20, page 181, Nahj Albalagha page 557