A class on Bhagavad Gita 4.28 given by His Divine Grace A.C. Bhaktivedanta Swami Prabhupada on April 17, 1974 in Mumbai, India.
Bhagavad Gita 4.28
dravya-yajñās tapo-yajñā
yoga-yajñās tathāpare
svādhyāya-jñāna-yajñāś ca
yatayaḥ saṁśita-vratāḥ
Having accepted strict vows, some become enlightened by sacrificing their possessions, and others by performing severe austerities, by practicing the yoga of eightfold mysticism, or by studying the Vedas to advance in transcendental knowledge.