Verse 21

तामप्यन्तः परित्यज्य ताभिर्व्यवहरन्नपि ।अन्तःशान्तसमस्तेहो भव चिन्मात्रवासनः

In plain words

That too abandon within, even while outwardly conducting yourself by means of them; with every striving stilled within, become one whose vāsanā is cit alone.