The earlier concept of four "varnas" or colors or strata ofsociety was based on four principles. a) one strata (Brahmins)focussing on prayers and devotional activities mainly because ofthe fear of nature's different forms, b) one strata( Kshathriyas)of warriors guarding the country and ruling the country, and c) onegroup (Vaishyas) mainly doing supplies of various materials toeveryone, and d) the fourth one (shudra) offering other services tothe above three. It was also known in the earlier times, that if aShudra got good education, or attained trading activity, he couldupgrde himself to the Vaisha or Brahmin class of activity. However,regretably over centuries, certain things got stuck in the psycheof people.