Verse 15

यथा समस्ताज्जलधौ जलादन्यन्न लभ्यते ।तथैव जगतः स्फारादात्मनोऽन्यन्न लभ्यते

In plain words

Just as, from the whole of the ocean, nothing but water is ever found, so, from the vast expanse of the world, nothing but the Self is ever found.