Verse 4

मद्वाक्यार्थैकतत्त्वज्ञ मद्वाक्यार्थैकभावनात् ।सुखमाप्नोषि सर्पारिर्यथाभ्ररवभावनात्

In plain words

O you who know the one truth in the meaning of my words: by single-minded contemplation on the meaning of my words you attain happiness — just as the enemy of serpents attains it from contemplation of the cloud's roar.