So the varnasrama system is the scientific division of society in which it is recognized that there are differences, and people are trained to act in a manner that is suitable for their ability and proclivity. And that is guided by the brahmanas, who understand that the purpose of human life is not simply production of goods and management of production of goods, but that's only to facilitate the actual goal of life, which is understanding what is Brahman – kim tad brahma kim adhyatma – to understand what is absolute truth, what is spirit.
Lecture on SB 3.6.32 – About the Four Varnas – Vyasa Puja 2008 – 5th Jan'08 – Tirupati