यल्लाभान्नापरो लाभो यत्सुखान्नापरं सुखम् ।यज्ज्ञानान्नापरं ज्ञानं तद्ब्रह्मेत्यवधारयेत् ॥ ५४ ॥
In plain words
Gain it, and there is nothing further left to gain. Its happiness — no other happiness goes beyond it. Know it, and no knowledge remains above that knowing. That is Brahman: settle it, and hold it settled.
Close to the Sanskrit
That from the gaining of which there is no other gain, that than whose happiness there is no other happiness, that than whose knowing there is no other knowledge — that is Brahman: thus one should firmly ascertain.