SB 2.8.16 purport…
The very idea of the scientific divisions of four classes of human society and four orders of life is also inquired about herewith on the basis of individual personal quality. The four divisions are exactly like the four divisions of one’s personal body. The parts and parcels of the body are nondifferent from the body, but by themselves they are only parts. That is the significance of the whole scientific system of four castes and four social orders. The value of such scientific divisions of human society can be ascertained only in terms of the proportionate development of devotional service to the Lord.
