Viveka is the first of the four qualifications of the seeker in Advaita Vedānta: the steady discrimination between the eternal and the passing, the self and what is not the self. In Sāṃkhya and Yoga, discriminative knowledge between pure consciousness and matter is the means of liberation.
Viveka
Discrimination: the discerning between the real and the unreal, the self and the not-self.
Also: discrimination