This may or may not be the case, but certainly panglossia, like parrhesia, denotes a readiness to utter anything.    From Wordnik.com.  [Dictionary of the History of Ideas] Reference

It has been suggested that when he spoke with horror of panglossia in the second Olympian Ode, he had in mind the word parrhesia.    From Wordnik.com.  [Dictionary of the History of Ideas] Reference