Verse 17

चिदेवैतदवस्त्वेव व्यतिरिक्ता तथात्मनः ।अनन्ता तद्गतैवाशु लहरीव महार्णवात्

In plain words

This is nothing but consciousness itself — indeed no real thing at all — yet standing apart from the Self in just this way; infinite, yet belonging wholly to That, arising swiftly, like a wave out of the great ocean.