If you simply pass your medical examination and sit down at home, nobody will call you physician. When you practically engage yourself in medical business, then people will call you physician. If you pass your law examination, don't go to the court, don't practice, nobody will call you lawyer. Any business you see. Suppose you know how to deal with electrical fittings. But if you do not do any business, if you sit down at home, nobody will call you electrician. When you practice, then you will be called electrician—with knowledge.
Similarly, the society should be divided with quality and work. That is scientific society. That quality can be divided into four, because there are three qualities in the material nature—goodness, passion and ignorance. So goodness, those who are qualified in goodness, they can be called as brāhmin. Those who are qualified with passion, they can be called a kṣatriya. Kṣatriya means the politicians, administrators. brāhmin means highly learned scholars, philosophers, theosophist, theologist, priests—like that. They are called brāhmin. So this society's division is already there. Anywhere you go, all over the world, the division is already, because there are three qualities of nature, and any man you find, he must be under one quality. So according to that quality, he is divided as a brāhmin, kṣatriya, vaiśya, śūdra. Quality. Not only quality; action also.