Social division of labor
In the same way when the population starts to grow, there is felt a need for this ?social division of labor?. Everyone has to find his niche and set there. Whenever our roles, position, place and social order is based on this principle of ?social division of labor? ? the society remains healthy and thriving.

Basis of four ?Varnas? : the social classes
In the same manner our body is divided into for gross sections ? 1) Head: it is the seat of perceiving, learning, thinking and guiding our body. 2) Hands: it performs chiefly the procuring and safeguarding work. 3) Abdomen: it receives the food and after proper digestion it distributes the nutrients to the whole body. 4) Legs: these serve us and our body and take us to desired place.

The four Varnas or the Indian caste system
Based on this physiological aspect, it is evident that in our society we can divide people into four major classes. This natural wisdom has been the base of the Varna order ? the Indian caste system in its purest and practical form.

As a single word in Sanskrit language has many meanings depending upon the context in which it is used. Some scholars misinterpret the word ?Varna? into color of the body and make a controversial statement that the Varna system refers to black and white color of the body and the associated stigma attached to color discrimination.

The four Varnas are ?
A) Brahmin: people suitable for this class took deep interest and are inclined towards learning, teaching, humanitarian and spiritual pursuits only. They are respected and lead the society with their wisdom, character and behavior.
B) Kshatriya: The military and police and other personnel who are safeguarding the fellow countrymen both from outside and inside.
C) Vaishya: these are the persons who pursue commercial activities.
D) Shudra: people of this class are serving the society with manual work and physical labor.

This classification is broad and perfectly serves the major classes of past times. It is also contextual in modern society. We can add and adopt this system to our needs while retaining the inherent beauty and integrity of this system.

How people are assigned to a particular class and nonrigidity of social classes
In ancient Vedic times and two centuries before, Gurukula system of education had been prevalent. Gurukulas are the residential campus for the students where teachers and students lived together and there was no discrimination of any kind ? financially, family background and racial or country wise. All the expenses are met by society and State. The student is assigned his or her class based on the character, behavior and studies. So this system was based on the character and behavior and not the birth.

Further anyone whosoever took the pain to work hard towards changing the course of his life, is welcomed in the new or higher class and vice versa.

Aren?t we practicing this system now?
We can easily fall prey to theorize and become rational and label ourselves as higher than our fellow beings. We can use this discriminatory and biased self-proclaimed superiority for wars, battles, social suppression or harassment of the part of the society. In this practical world can we think without this Natural Social System? Definitely not.