उपादानं प्रपञ्चस्य ब्रह्मणोऽन्यन्न विद्यते ।तस्मात्सर्वप्रपञ्चोऽयं ब्रह्मैवास्ति न चेतरत् ॥ ४५ ॥
In plain words
Search for what this whole spread-out world is made of, and you find nothing other than Brahman — no second substance anywhere. So this entire world is Brahman itself, and nothing else at all.
Close to the Sanskrit
A material cause of the manifold world, other than Brahman, is not found. Therefore this entire manifold world is Brahman alone, and not anything else.