That is not sufficient. Now they want to fly. You see. Another discovery. This is going on. Manaḥ-ṣaṣṭhānīndriyāṇi prakṛti-sthāni karṣati (BG 15.7). Actually they are manufacturing different ways of suffering. And there is no happiness. Simply the business is going on, manufacturing different ways of suffering. So therefore that is disease. This is our material disease, and it is recommended here that before the next death, if we come to the right conclusion how we shall become happy, then this process of continuously dying and again taking birth and again disease and again old age, then it is not very good.
But they are so fools and rascals, they do not know how the life is going on, how nature is working upon us. Everything is in darkness. Therefore Kṛṣṇa consciousness is the only hope for human society. Only hope. It is not story; it is fact. So those who have come to Kṛṣṇa consciousness, I request that take it very seriously and read the books and make progress and simply try to understand Kṛṣṇa. Then everything, all problems, will be solved.