There are those whose sacrifice is wealth, whose sacrifice is austerity, and others whose sacrifice is discipline (yoga); Ascetics of severe vows, whose sacrifices are scriptural study and knowledge (jñāna).
Ascetics who keep strict vows sacrifice with material objects, through penance, discipline, study of sacred lore, and knowledge.
(28) Some offer up their wealth, some their hard penances, some spiritual exercise, and some again make study and knowledge [of scripture] their sacrifice—religious men whose vows are strict.
4.28 Similarly, others are performers of sacrifices through wealth, through austerity, through yoga, and through study and knowledge; others are ascetics with severe vows.
4.28 Self-controlled and firm of resolve, others perform the sacrifice of material objects or austerities or Yoga; while others offer their scriptural study and knowledge.
4.28 Others again offer wealth, austerity and Yoga as sacrifice, while the ascetics of self-restraint and rigid vows offer study of scriptures and knowledge as sacrifice.