So people do not know this, how this science is working, but this is the fact. Prakṛteḥ kriyamāṇāni guṇaiḥ karmāṇi sarvaśaḥ (BG 3.27). Tathā dehāntara-prāptiḥ (BG 2.13). So we have to read all these things very carefully. Tathā dehāntara-after death there is dehāntara, another body. So we must be very careful what kind of body I'm going to get. Now, this life I have got very nice, beautiful body, and everything is all right. But if we act irresponsibly, the nature will give me a suitable body. Otherwise, why there are so many varieties of life, 8,400,000? Therefore we should be very, very careful not to waste the duration of life even by a second. We shall eat less, then we shall sleep also less. Nidrāhāra-vihārakādi: then our sex appetite also will be lessened. Unnecessarily eating, unnecessarily sleeping is not required at all. That is the practice by the Gosvāmīs. Nidrāhāra-vihārakādi-vijitau. They conquered over eating, sleeping. Mating, there was no question: they were sannyāsī, renounced order of life. And defense also, there was no question, because they depended on Kṛṣṇa, the most powerful defender. So there was no question of defense. Simply two things, eating and sleeping. And that they also conquered. Nidrāhāra-vihārakādi-vijitau cātyanta-dīnau ca yau (Sad-Gosvami-astaka 6).
So spiritual life means you have to control. That is called gosvāmī. One who has control over the senses, one who has control over eating, you'll find this instruction in the Nectar of Instruction: jihvā-vegam udaropastha-vegam manaso vegam etān vegān yo viṣaheta dhīraḥ pṛthivīṁ sa śiṣyāt (NOI 1). Guru should be . . . Guru means one who has control over the six duties, six engagements. Manaḥ, to control the urge of the mind. The mind wants to do this. "No, if it is not profitable, don't do this." The control over the mind. Control over the senses, control the words. I am angry, I want to abuse somebody with some ill names. "No, why shall I . . ." Control of the . . . Talking unnecessary, useless talking, that is control over the tongue. Vāco vegam. Krodha-vegam: "I am just going to be very angry upon you." No, we have to control. In this way, when one is able to control over these things, especially jihvā-vegam udaro-vegam upastha-vegam, straight line—the urge of the tongue, the urge of the belly and the urge of the genital—then we become svāmī, gosvāmī. Artificially, it is not . . . It is to be practised. Nidrāhāra-vegam, these are material things.