Bhagavadgita 4.31

4.31

yajñaśiṣṭāmṛtabhujo yānti brahma sanātanam
nāyaṃ loko 'sty ayajñasya kuto 'nyaḥ kurusattama

Brahman is the oblation; with Brahman (as a sacrificial instrument) it is offered up; Brahman is in the fire; and by Brahman it is thrown; and Brahman, too, is the goal to which he proceeds who meditates on Brahman in the action. Some devotees perform the sacrifice to the gods, some offer up the sacrifice by the sacrifice itself in the fire of Brahman. Others offer up the senses, such as the sense of hearing and others, in the fires of restraint; others offer up the objects of sense, such as sound and so forth, into the fires of the senses. Some again offer up all the operations of the senses and the operations of the life-breaths into the fire of devotion by self-restraint, kindled by knowledge. Others perform the sacrifice of wealth, the sacrifice of penance, the sacrifice of concentration of mind, the sacrifice of Vedic study, and of knowledge, and others are ascetics of rigid vows. Some offer up the upward life-breath into the downward life-breath, and the downward life-breath into the upper life-breath, and stopping up the motions of the upward and downward life-breaths, devote themselves to the restraint of the life-breaths. Others, who (take) limited food, offer up the life-breaths into the life-breaths. All of these, conversant with the sacrifice, have their sins destroyed by the sacrifice. Those who eat the nectar-like leavings of the sacrifice repair to the eternal Brahman. This world is not for those who perform no sacrifice, whence (then) the other, O best of the Kauravas! Thus sacrifices of various sorts are laid down in the Vedas. Know them all to be produced from action, and knowing this you will be released (from the fetters of this world). The sacrifice of knowledge, O terror of (your) foes! is superior to the sacrifice of wealth, for action, O son of Prithâ! is wholly and entirely comprehended in knowledge. That you should learn by salutation, question, and service. The men of knowledge who perceive the truth will teach knowledge to you. Having learnt that, O son of Pându! you will not again fall thus into delusion; and by means of it, you will see all beings, without exception, first in yourself, and then in me. Even if you are the most sinful of all sinful men, you will cross over all trespasses by means of the boat of knowledge alone. As a fire well kindled, O Arguna! reduces fuel to ashes, so the fire of knowledge reduces all actions to ashes. For there is in this world no means of sanctification like knowledge, and that one perfected by devotion finds within one's self in time. He who has faith, whose senses are restrained, and who is assiduous, obtains knowledge. Obtaining knowledge, he acquires, without delay, the highest tranquillity. He who is ignorant and devoid of faith, and whose self is full of misgivings, is ruined. Not this world, not the next, nor happiness, is for him whose self is full of misgivings. Actions, O Dhanañgaya! do not fetter one who is self-possessed, who has renounced action by devotion, and who has destroyed misgivings by knowledge. Therefore, O descendant of Bharata! destroy, with the sword of knowledge, these misgivings of yours which fill your mind, and which are produced from ignorance. Engage in devotion. Arise!