Verse 20

तामसीर्वासनाः पूर्वं त्यक्त्वा विषयवासिताः ।मैत्र्यादिभावनानाम्नीं गृहाणामलवासनाम्

In plain words

Having first abandoned the tāmasic vāsanās, steeped in sense-objects, take up the stainless vāsanā named 'the cultivation of maitrī and the rest'.