Pradyumna: "The Vedas contain regulated principles of knowledge covering social, political, religious, economic, military, medicinal, chemical, physical, and metaphysical subject matter and all that may be necessary to keep the body and soul together."
Prabhupāda: Just like in the Vedas there is direction how to prepare by chemical process gold. That is also there. Gold, there is a suggestion that you mix three metals, namely nickel, copper, and mercury, you'll get gold. This direction is there. And many persons, saintly persons, yogis, they know how to prepare it, and they do it. So in that way they meet their expenditures. They prepare gold. The chemical knowledge. Go on.