The caste system, cātur-varṇyam . . . perhaps you have heard about Indian caste system. That caste system is natural. Of course, in India it has become a hereditary thing, but this caste system is all over the universe, even amongst the animal society. That division of caste is made according to quality and work. Quality and work. Now that caste system, that quality and work, is divided according to the . . . quality means quality of the material modes of nature.
There are three qualities by which the material world is moving: the quality of goodness, the quality of passion and the quality of ignorance. Those who are situated on the quality of goodness, they are called brahmins. And their symptoms are also mentioned in the Bhagavad-gītā. I shall give you a statement of those systems. Now, those who are situated on the quality of goodness, they are called brahmins. That quality of goodness is current all over the universe. So anyone situated in that quality, he is brahmin. And those who are situated in the quality of passion, they are called kṣatriyas. And those who are situated in the quality of . . . mixed quality of ignorance and passion, they are called vaiśyas, or the mercantile community. And those who are situated in the quality of ignorance, they are called śūdras, or the laborer class.
So in this way there are different classes and different castes all over the world. You may call it caste or division of labor or division of the society. These four divisions are there all over the universe: the intelligent class, the administrative class, the productive class and the laborer class.