You are simply instrument in the hands of Kṛṣṇa. That is intelligence. Therefore you should work as Kṛṣṇa desires. That is real intelligence. If you work in Kṛṣṇa consciousness, that is real intelligence. And if you work against Kṛṣṇa, that is foolishness. That is the distinction between intelligent and foolishness. Jñānam. Jñāna means knowledge. Now, so far knowledge is concerned, here is a key packet. If you want to make research who has made this packet, who has discovered it, in which country first it was introduced, in what material it is made, oh, you can write volumes of books. You can speculate in any damn thing, and you can write volumes of books. That does not mean that you are a man of knowledge. There are so many.
I'll give you one very nice example. This is practical. In my youthhood I was manager in a big chemical firm. So there was a sulphuric acid chamber. There was some defect. It was not working well. In that chamber sulphur is given, and it is fused, and then acid comes out. So it was not working. So there were many scientists. They were sitting, consulting books: "Oh, why it is not working?" Then the managing director, Dr. Bose... He was very intelligent man. He at once went to another firm. They were also chemical. He knew there was an ordinary worker; he was very experienced. So... He was Muhammadan. He called him at once, "Just come and see what is defect there." And he at once came and manipulated some machine—at once acid transformed. All the theoretical scientists, they sat down. So this kind of experience you'll find even an ordinary man.