Mantra 12

एको वशी सर्वभूतान्तरात्मा एकं रूपं बहुधा यः करोति ।तमात्मस्थं येऽनुपश्यन्ति धीरास्तेषां सुखं शाश्वतं नेतरेषाम् १२

In plain words

The one controller, the inner Self of all beings, who makes his single form manifold -- the wise who perceive him abiding within the self, theirs is eternal happiness, not others'.