Devan bhavayatanena te deva bhavayantu vah
parasparam bhavayantah sreyah param avapsyatha
(Text 11, Karma Yoga, Ch 3)
Meaning: The demigods, being pleased by sacrifices, will also please you, and thus, by cooperation between men and demigods, prosperity will reign for all.
By performing yajnas (Karma, sacrifice) all activities become purified. By performing of yajna one eat-ables become sanctified, and by eating sanctified foodstuffs one’s very existence become purified; by the purification of existence finer tissues in the memory become sanctified, and when memory is sanctified one can think of the path of liberation, and all these combined together lead to divine consciousness, the great necessity of present day society.