Simply theoretical knowledge that so much quantity of hydrogen and so much quantity of oxygen will make water will not help him. He has to practically show in the laboratory that so much quantity of oxygen gas and so much quantity of hydrogen gas mixed, and water is produced. That is called vijñāna. Vijñāna.
So jñāna-vijñāna-tṛptātmā. One should have not only theoretical knowledge, but practical knowledge. Practical knowledge. Simply understanding that "I am not this body, I am not this body," then I am doing all nonsense of this body . . . I am discussing . . . there are so many societies, they are very seriously discussing Vedānta philosophy and smoking, with wine glass, and very enjoying life. You see? So that sort of jñāna, that sort of knowledge, is not necessary. You see? (chuckles)
So jñāna-vijñāna. One should have knowledge perfectly, and it must be demonstrated. Demonstrated in practical field. Yes. But that means one who has actually felt himself that, "I am not this body," then naturally his bodily necessities will be reduced to the minimum. Will be reduced to the minimum. That is practical. If I am going to increase the demands of my body and I am simply theoretically thinking that, "I am not this body," oh, that is not required. Jñāna-vijñāna-tṛptātmā.
A man, a person, will be satisfied when there is jñāna, knowledge, and science side by side. Jñāna-vijñāna, practical knowledge. Kūṭastho vijitendriyaḥ. Then he's conquered over the senses.