Satya-yuga means people are all very advanced in spiritual life. Dvāpara-yuga . . . Tretā-yuga means one-fourth sinful, three-fourths pious. Dvāpara-yuga means half and half. Kali-yuga means one-fourth pious and three-fourths sinful. In this way, when Kali-yuga will be finished, again Satya-yuga will come. This is yuga. Is it clear to you? Yes.
So this is not very important thing. This is material changes. They come and go. If we take to Kṛṣṇa consciousness then you are above all these things, because as soon as you become spiritually elevated, these material changes does not effect. Just like Kali-yuga means three-fourths sinful life. So one who has taken to Kṛṣṇa consciousness, becomes devotee, he has no sinful life, although he is in the Kali-yuga. He is not affected. Just like there is police, but if you are not a criminal, the police has nothing to do with you; and if you are a criminal, you may be on the street or in your very nice flat, apartment, the police will be after you and arrest you. So if you become pure, there is no influence of this yuga.
- kalau nāsty eva nāsty eva
- nāsty eva gatir anyathā
- (CC Adi 17.21)
But if you are impure, it doesn't matter that you go to the forest or you are in your apartment—the nature will not excuse you.
- tad viddhi praṇipātena
- paripraśnena sevayā
- (BG 4.34)
It is recommended in the śāstra by service, by surrender, by question, try to understand this transcendental subject matter.
- tad vijñānārthaṁ sa gurum evābhigacchet
- samit-pāṇiḥ śrotriyaṁ brahma-niṣṭham
- (Muṇḍaka Upaniṣad 1.2.12)
These are the Vedic injunctions.