A proper noun is a specific (i.e., not generic) name for a particular person, place, or thing. Proper nouns are always capitalized in English, no matter where they fall in a sentence. ... A common noun is the generic name for one item in a class or group.
common noun:A common noun is the generic name for a person, place, or thing in a class or group. Unlike proper nouns, a common noun is not capitalized unless it either begins a sentence or appears in a title. ... All nouns name something, but proper nouns name them specifically.
In "Metamorphosis" by Franz Kafka Gregory Samsa is transformed into an insect. Nobody would help him until his family listen to his voice and call the doctor and the locksmith for help. Gregor believed that either the doctor or the locksmith would help him which makes him a person of faith or a believer.