There is no level above that of the great God

एको देवो महादेवो विज्ञेयस्तु महेश्वरः |
न तस्य परमं किञ्चित्पदं समधिगम्यते || 15 ||

 

The one Deva, the great Deva should really be known as the great God. No level above his can be reached (no level above his exists).