। ॥ ३६६ ॥
In plain words
Only in a samādhi with no distinctions left does Brahman become clear beyond any doubt. No other way works, because a mind that is still moving keeps dragging in other thoughts and mixing them into what should be one, undivided seeing.
Close to the Sanskrit
By thought-free samādhi, the truth of Brahman is clearly, certainly known. Not otherwise — because of the restlessness of the mind's movement, it would become mixed with other cognitions.