Verse 35

मनसैव मनश्छित्त्वा कुठारेणेव पादपम् ।पदं पावनमासाद्य सद्य एव स्थिरो भव

In plain words

Cutting the mind by mind alone, as one fells a tree with an axe, and reaching the purifying state — become steadfast this very instant.