Verse 4

अहो नु खलु रम्येयं शमभूः शीतलान्तरा ।सर्वा एव शमं यान्ति सुखदुःखदृशः शमे

In plain words

Ah, how truly delightful is this ground of śama, cool at its very heart! In śama, every sight of pleasure and of pain alike comes to quiescence.