18.30 'Activity' is that Dharma which is the means for wordly prosperity. 'Renunciation' is that Dharma which is the means for release. The Buddhi which knows both these as they are, is Sattviki-buddhi. Further, such a Buddhi is capable of distinguishing between what ought to be done and what ought not to be done by persons of different stations in life, having as their duty activity or renunciation at particular places or times. Such a Buddhi helps them to know 'This ought to be done and this ought not to be done.' Such a Buddhi discerns transgression of the Sastras as the cause of fear and observance of the Sastras as the cause of fearlessness. It enables one to distinguish between bondage and release, the true nature of Samsara and deliverance from it. The Buddhi that functions in these ways is Sattvika.