If the guṇas could turn sāttvika as easily as that, the demonic guṇas in the world would have been uprooted in a minute. For this, some further kinds of purity must still be seen to. Listen. The chief ones are these: first, the purity of the materials; second, the purity of the vessel; third, the purity of the one who cooks or of the one who has the cooking done.”