"Paragata-Svikara", NirHetuDaya of Bhagavan Shree Narayana and "Shree Mundaka-Upanishad"...

I am extremely glad to turn to one of the Hindi editions of "Shree Vachana-Bhushanam" by OM VishnuPad Shree Pillai LokAcharya this season. 

The following is the brilliant excerpt which actually starts the explanation of "PARAGATA-SVIKARA"-notion. 

As you can see very orthodox Vaidika Praman from "Shree Mundaka-Upanishad" is being cited: