It's a reference to Dr. Pangloss, a character in Voltaire's Candide, who gave us the English-language adjective 'panglossian'.
Pan·gloss·ian (adjective) \pan-ˈglä-sē-ən, paŋ-, -ˈglȯ-\
Definition of PANGLOSSIAN
: marked by the view that all is for the best in this best of possible worlds : excessively optimistic
Origin of PANGLOSSIAN
Pangloss, optimistic tutor in Voltaire's Candide (1759)
First Known Use: 1831
http://www.merriam-webster.com/dictionary/panglossian











