To be always optimistic regardless of the facts.
From the name of the tutor and philosopher in Voltaire’s Candide (1759)
“He’s such a pangloss, he’d see he positive in anything.”
“Her panglossian thinking always got us through.”
Chimaera (noun) (also Chimera)
(in Greek mythology) a fire-breathing female monster with a lion’s head, a goat’s body, and a serpent’s tail. (modern biology) An organism containing a mixture of genetically different tissues, formed by processes such as fusion of early embryos, grafting, or mutation.
Late Middle English: via Latin from Greek khimaira ‘she-goat or chimaera’.