The reader might assume that the Lord"s deliverance of the Ninevites from imminent doom is the climax of the story. This is not the case. The most important lesson of the book deals with God"s people and specifically God"s instruments, not humanity in general. [source][source][source]
"Though Jonah hardly comes across as a hero anywhere in the book, he appears especially selfish, petty, temperamental, and even downright foolish in chap4." [1][source]