Everything should be learned from the standard Vedic literature, and society and other things, economic development, everything. So that is here in the Bhagavad-gita. All problems, whatever you want, you consult Bhagavad-gita — you’ll have perfect answer.

From Srila Prabhupada’s lecture on Bhagavad-gita 16.7 — February 3, 1975, Honolulu