Mahabharata 12.262.2

12.262.2

śarīrametatkurute yadvede kurute tanum |
kṛtaśuddhaśarīro hi pātraṃ bhavati brāhmaṇaḥ || 2 ||

"Kapila said, 'The Vedas are regarded as authoritative by all. People never disregard them. Brahma is of two kinds, viz., Brahma as represented by sound, and Brahma as Supreme (and intangible). One conversant with Brahma represented by sound succeeds in attaining to Supreme Brahma. Commencing with the rites of Garbhadhana, that body which the sire creates with the aid of Vedic mantras is cleansed (after birth) by Vedic mantras. When the body has been cleansed with purificatory rites (performed with the aid of Vedic mantras), the owner there of come to be called a Brahmana and becomes a vessel fit for receiving knowledge of Brahma. Know that the reward of acts is purity of heart which only leads to Emancipation. I shall presently speak to thee of that. Whether purity of heart has been attained or not (by performance of acts) is what can be known to the person himself who has attained it. It can never be known with the aid of either the Vedas or inference. They that cherish no expectation, that discard every kind of wealth by not storing anything for future use, that are not covetous, and that are free from every kind of affection and aversion, perform sacrifices because of the conviction that their performance is a duty. To make gifts unto deserving persons is the end (right use) of all wealth.