Verse 17

एवं ब्रह्मात्मकमिदं यत्किंचिज्जगति स्थितम् ।सदेवास्मि तदेवास्मि परिशोचामि किं मुधा

In plain words

Thus, whatever at all stands in this world is of the very substance of Brahman; I am that alone which truly is, I am that alone -- why should I grieve, and to no purpose?