A class on Bhagavad Gita 4.2 given by His Divine Grace A.C. Bhaktivedanta Swami Prabhupada on March 22, 1974 in Mumbai, India.

Bhagavad Gita 4.2

evaṁ paramparā-prāptam

imaṁ rājarṣayo viduḥ

sa kāleneha mahatā

yogo naṣṭaḥ paran-tapa

This supreme science was thus received through the chain of disciplic succession, and the saintly kings understood it in that way. But in course of time the succession was broken, and therefore the science as it is appears to be lost.