Verse 36

धीः सम्यग्योजिता पारमसम्यग्योजिताऽऽपदम् ।नरं नयति संसारे भ्रमन्ती नौरिवार्णवे

In plain words

The understanding, rightly applied, leads a man to the far shore; wrongly applied, to calamity -- in saṃsāra, like a boat voyaging on the ocean.