Some offer their wealth, their austerity, and their practice of yoga as sacrifice, while the ascetics with strict vows offer their study of scriptures and knowledge as sacrifice.
Whatever you do, whatever you eat, whatever you offer as oblation to the sacred fire, whatever charity you give, whatever austerity you perform, do all that as an offering unto Me.
Offer unto me that which is very dear to thee -- which thou holdest most covetable. Infinite are the results of such an offering.