Sūta said: Perfect clear knowledge certainly originates from contact with the preceptor. It is uncontaminated by lust, hatred, falsehood, anger, passion, covetousness and the like. It should be known as the bestower of salvation. Since the man has the impurity of ignorance he is contaminated. Salvation takes place only when, impurity is dispelled and not otherwise, even if one takes a crore of births. Without perfect knowledge[31] neither merit nor demerit is destroyed. Hence, O most excellent ones among the knowers of the Brahman, practise knowledge alone as the means of liberation. It is only by practice of perfect knowledge that the intellect of men becomes free from impurities.