Dear alpesh patel, HERE IS THE GOOD EXPLANATION OF INDIAN CASTE SYSTEM IN ITS ORIGINAL FORM. This original division of people in to 4 different types is purely based on character and nothing else. This is excerpted from the world famous spiritual masterpiece "Autobiography of a Yogi" by "swami paramahamsa yogananda". Here is the explanation given in the foot note of the books chapter number 41. The link to this book online is at http://www.crystalclarity.com/yogananda/chap41.html
Above book is the spiritual masterpiece and here are the acclaims that this book gained worldwide:
http://www.srf-yogananda.org/special_ancmnts/ayanniversary/intro.html ------------------ Inclusion in one of these four castes originally depended not on a man's birth but on his natural capacities as demonstrated by the goal in life he elected to achieve," an article in East-West for January, 1935, tells us. "This goal could be (1) kama, desire, activity of the life of the senses (Sudra stage), (2) artha, gain, fulfilling but controlling the desires (Vaisya stage), (3) dharma, self-discipline, the life of responsibility and right action (Kshatriya stage), (4) moksha, liberation, the life of spirituality and religious teaching (Brahmin stage). These four castes render service to humanity by (1) body, (2) mind, (3) will power, (4) Spirit. "These four stages have their correspondence in the eternal gunas or qualities of nature, tamas, rajas, and sattva: obstruction, activity, and expansion; or, mass, energy, and intelligence. The four natural castes are marked by the gunas as (1) tamas (ignorance), (2) tamas-rajas (mixture of ignorance and activity), (3) rajas-sattva (mixture of right activity and enlightenment), (4) sattva (enlightenment). Thus has nature marked every man with his caste, by the predominance in himself of one, or the mixture of two, of the gunas. Of course every human being has all three gunas in varying proportions. The guru will be able rightly to determine a man's caste or evolutionary status. "To a certain extent, all races and nations observe in practice, if not in theory, the features of caste. Where there is great license or so-called liberty, particularly in intermarriage between extremes in the natural castes, the race dwindles away and becomes extinct. The Purana Samhita compares the offspring of such unions to barren hybrids, like the mule which is incapable of propagation of its own species. Artificial species are eventually exterminated. History offers abundant proof of numerous great races which no longer have any living representatives. The caste system of India is credited by her most profound thinkers with being the check or preventive against license which has preserved the purity of the race and brought it safely through millenniums of vicissitudes, while other races have vanished in oblivion."
