Again it is said: "Why should we study the Vedas? Why should we perform sacrifices?"—in such places, the renunciation of sacrifice and the like is spoken of. Therefore, the true purpose of the statement "Only after discharging the three debts does knowledge arise" (Manusmriti, 6.35)—is this: the person who has entered the householder's stage, yet thinks, "My goal will be fulfilled through self-knowledge alone," and on that account remains indifferent to discharging the three debts (performing the prescribed sacrifices)—if he does not complete them, he commits sin. And that very sin becomes an obstacle to the dawn of knowledge. To put it plainly: not all ordinances of scripture lead to the path of knowledge—this is not a universal principle. In some texts the renunciation of sacrifice is taught, in others the performance of sacrifice—both are spoken of according to context. Therefore, "without discharging the three debts, knowledge will not arise"—this is a rule applicable to the householder; but it is not a universal truth.
According to another view, sacrifices and the like—whose fruits (such as the attainment of heaven) fulfill their own purpose—are nonetheless held to be auxiliary aids within knowledge, according to the principle of "the unity of the dual and non-dual." As the Shruti has declared—"Brahmins through the study of the Vedas and sacrifice seek to know That" (Brihadaranyaka Upanishad, 4.4.22). Yet here sacrifice and the like are aids to knowledge—in the sense that they help to manifest knowledge, not in producing some separate fruit; just as the prāyāja ritual plays a role in bringing about the fruit; for there is no fruit beyond knowledge.
Prāyāja is a subsidiary ritual (sub-ritual) of Vedic sacrifice. Before the main sacrifice begins, five small oblations are offered into the fire, and these are called prāyāja. Its meaning: "Prā + āyāja" → the initial or preliminary oblation. These prepare and purify for the main sacrifice (such as the new and full moon sacrifice, the agnishtoma, and so forth). Without the prāyāja, the main sacrifice is considered incomplete. These are auxiliary in making the sacrifice efficacious, but they themselves produce no independent fruit. Ordinarily, oblations are offered into the fire for five deities: Agni, Soma, Savitur, Saraswati, and Pushan. These five deities symbolize sacrificial power, the power of life, and the power of knowledge. Prāyāja is the small oblation performed at the beginning of sacrifice. These are subsidiary to the main rite; just as life cannot subsist without warmth in the body, so too the main sacrifice does not attain completion without the prāyāja.
Now, let us consider the acceptable view concerning "purification"—sacrifices and the like purify the human being, and that very purification makes him worthy of attaining knowledge. This is why the Smriti states: "Knowledge arises in the pure person." And in the Brahma Sutra as well (3.4.32) it is said—"The sacrifices pertaining to the ashrams must surely be performed, for they are ordained in scripture." Though sacrifice has its own fruit (such as the attainment of heaven), these actually aid in the manifestation of knowledge. There is no supreme fruit other than knowledge. Sacrifice bestows inner purification upon the human being, and it is in the pure person that the knowledge of self dawns. This is why scripture says—the sacrifices of the ashram-dharma must surely be performed.
Objection: Knowledge arises from the valid means of direct knowledge; therefore, those direct means that are amenable to practice—such as control of mind, control of the senses, and so forth—are the special means, and whatever removes the restlessness of the mind should certainly be pursued. For only that person—who practices meditation with a peaceful mind—attains pure knowledge. Sacrifice and the like are not necessary here; for knowledge is attained through meditation alone, without sacrifice.
Refutation: This is true; thus those who observe celibacy throughout life seek to attain pure knowledge in this very way, even without sacrifices. Yet there is a difference in terms of time—when special means are present, knowledge is revealed quickly or very quickly; and when those means are absent, it is revealed slowly or very slowly.