। ॥
In plain words
'Duality while enquiring, non-duality on knowing the highest truth': this is not a sound saying. When the tenth man was thought lost, before the search, and afterwards when he was found, his being the tenth was one and the same.
Word for word
'Duality in enquiry, but non-duality in knowing the highest truth': this is not a sound saying. Before the search, when the tenth was lost, and afterwards, when he was found, his being the tenth was one.