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.