Kamma(business) caste people are the most hard-working people. Other 6000 castes need know and strive hard "by listening/reading well" about what tellers say. LISTENERS ARE GOOD(MORAL) TELLERS about what they are doing(listening). LISTENER/READER IS LISTENING/READING OTHER/S WELL BECAUSE LISTENER/READER IS KNOWLEDGEABLE ENOUGH ABOUT WHAT TELLER SAYS. You can't listen wrong(two into two is not four) forever even though teller says wrong(two into two is not four). Isn't it ?