Example Sentences:

Ramayana:  Ravana began the war against Rama with a Panglossian confidence in his forces but as demon after demon was killed, his attitude changed to disbelief and then despair.

Mahabharata:  Initially Yudhisthira had a Panglossian confidence in the virtue of always obeying his elders, but seeing the partiality of Dhritarashtra made him rethink his ethical understanding.

Bhagavad-gita:  Materialistic people often have a Panglossian faith in the capacity of material things to provide them great happiness.