Have you heard of Upamanyu? His guru once told him, "Oh, you go out to graze cows all day, and you do not bring with you anything to eat, and yet you are very healthy and fat. Why is that? Do you drink milk from the cows udders?" Upamanyu replied, "Yes I do." His guru told him, "Don't drink it anymore", but he did not tell him what he would be allowed to eat or drink. During the next days Upamanyu continued to go out...