सोऽयं नित्यानित्यवस्तुविवेकः समुदाहृतः ।तद्वैराग्यं जुगुप्सा या दर्शनश्रवणादिभिः ॥ २१ ॥
In plain words
This — this very thing — is what's called viveka, telling the lasting from the passing. And vairāgya is the aversion that grows in you from seeing, again and again, and hearing...
Close to the Sanskrit
This is declared to be discrimination between the eternal and the non-eternal entity. Dispassion (vairāgya) is the aversion which [arises] through seeing, hearing, and so forth...