The Bhāgavata it is already stated, lavaṇyaṁ keśa-dharaṇam (SB 12.2.6). Keśa means hair. To keep long, long hair will be the practice of people, because they will think by keeping long hair they look very beautiful. That is stated in Bhāgavata. Five thousand years this prediction is there, "In this Kali-yuga people will keep long hair, and . . . because that will be appreciated, that a man keeping long hair is very beautiful." So that is happening. Just see. Five thousand years ago that was written, and that is happening. There are so many things.
That is called śāstra. It is truth for all the days—past, present, future. Dāmpatye ratim eva hi. These things are stated. "Husband and wife will keep together so long their sex power is strong. Otherwise they will divorce." This is written. Svīkāram eva hi udvahe: "Marriage will be performed simply by agreement." According to Vedic system, marriage is a long program. The father of the girl and the boy first of all select. Then their horoscope should be consulted, how they will mix together, and then the family, then personal qualification, so many things . . . then dowry . . .
After all this consideration, when everything is satisfactory, then the father and mother of both sides will agree, and they will be married. That is marriage. Now, at the present moment in Kali-yuga, it is said, svīkāram eva hy udvahe. Boys and girls will loiter in the street and two of them, as they agree, "Yes, we will live together." That's all. Bās. This is stated. And that is happening.
So this is called śāstra. Five thousand years ago, what was predicted, that is now happening. Therefore we give so much stress on the śāstra that it is perfect. There is no mistake. If you write one book, I write one book, because we are imperfect, it is all imperfect.