Whether purity of heart has been acquired or not, is what can be known to the person himself who has acquired it. It can never be known with the help of either the Vedas or inference. They who have no expectations, who discard every sort of riches by not keeping anything for future use, who are not covetous, and who are free from every sort of affection and aversion, celebrate sacrifices believing only that their performance is a duty. To make gifts to deserving persons is the end of all riches.