The term ‘Parable’ in literature teaches -

Parable: (নীতিগর্ভ রূপককাহিনি; রূপক)
An allegorical story of human characters which teaches a religious moral. There are several famous parables in the Bible.
It teaches God's supremacy and His ways to man.
Source: An ABC of English Literature by Dr. M Mofizar Rahman.