We should be careful, the Kṛṣṇa consciousness movement, that these four principles, if you indulge in unrestricted, then you become contaminated. But if you take precaution in executing these four principles . . . we don't say that you don't have sex life. You have. But for this purpose, not for this purpose. Similarly, you eat, but you eat this way, not that way. So defend . . . Kṛṣṇa also advised Arjuna to defend. So defend is also not prohibited, provided it is for right cause.
So in this way if we can come to Kṛṣṇa consciousness, immediately we become free from all contamination. And if we take precaution of these four principles, then our life is pure. And if we can continue this pure life till the time of death, you are sure to be transferred to the kingdom of God.
Go on. That is stated in Bhagavad-gītā; you have already read: tyaktvā dehaṁ punar janma naiti (BG 4.9).
By giving up this body, that person who is fully in Kṛṣṇa consciousness, he does not come back again to take part in this material world. This yogī who is coming to a good family, to a righteous family or rich, aristocratic family, they are coming back. But if you are perfect Kṛṣṇa consciousness, you are no more coming back; you are situated in the Goloka Vṛndāvana in the spiritual sky.
So we should try not to come back again. Because if I come back again . . . suppose I have got very nice chance: I have got birth in a very good family, in rich family. But if I cannot utilize it properly, then again I degrade myself to other sort of life. So why should we take this risk. Better complete Kṛṣṇa consciousness in this life. It is very simple. It is not very difficult. Simply to keep yourself in thoughts of Kṛṣṇa, that's all. It is very simple thing. Then you are assured of your next birth in the spiritual sky, in the kingdom of God or in the Goloka Vṛndāvana.