We have to accept knowledge from Veda, Vedic knowledge, not this rascal's knowledge. Rascal knowledge is that, "Yes," as soon as he comes to the imperfect point, "Yes, we are trying." You are trying. What is this trying? Trying means that your knowledge is imperfect. And another rascal will come, he will say: "Now here is the perfect." And ten years after, another rascal will come," "No, this is not perfect. This is perfect." This is going on. This is called scientific advancement. This is . . . advancement means . . .
But we don't change our Vedic knowledge. We do not say: "Now, Kṛṣṇa, five thousand years ago, said like this. Now we are advanced; we change this line." Of course, others are doing. In the scriptures . . . just like the Christians, they are changing the words. But you cannot do that. Then where is the authority? If you change the word of the scripture, then where is the authority of the scripture?
Just like in law books, there is some law made already. Whimsically you cannot, I mean to say, erase the words and put something that, "It should be changed like this." That will not be accepted. Law, if there is change . . . actually, there is no change. There cannot be change. Real law means there is no change. Just like day and night, it is coming. The fortnight, the dark period and the light period, it is coming for millions and millions and time immemorial. The same law is going, going on. You cannot change. So as soon as you change, that means it is imperfect.