Do you understand the lesson taught to Jonah?

Did you know that Jonah was fearful of preaching the destruction on a wicked city? That's why he was swallowed by a large fish. (You can read this account in Jonah.)
Jonah then did go back and preach destruction on the city - a warning message! But do you know what happened?
The people repented and turned back from their wicked way. Jonah, though, was angry. All he had gone through, he felt these people deserved destruction. Jonah 4:1 He even felt like he should have stayed home, rather than have preached the message of warning on the wicked.
Jonah 4:2, 3 He even asked to die! He had preached doom, and now it wouldn't happen. He may have felt embarrased, shame, or just upset he was swallowed by a fish for something that would never occur.
Jehovah God though, was not angry with Jonah, instead He asked him "Have you rightly became hot with anger?" Jonah 4:4 Did Jonah even answer, the bible record is silent.
The despondent prophet left Nineveh and head, not home, but eastward, where some mountains overlooked the region. He built a little shelter and settled in to wait and watch Nineveh. Perhaps he still clung to the hope of witnessing her destruction.
Overnight, Jehovah caused a bottle-gourd plant to sprout up. Jonah woke to see this luxuriant growth, with it's broad new leaves providing far more shade than his flimsy shelter ever could. His spirits lifted. "Jonah began to rejoice greatly." over the plant, perhaps thinking it was a blessing from God as a sign of His approval. However, Jehovah wanted to do more for Jonah than simply deliver him from the heat and from his own petulant anger. He wanted to reach Jonah's heart. So God used a worm to attack and kill the plant. Then he sent a parching east wind until Jonah began swooning away from the heat. Again the man's spirits plummeted, and he asked God that he might die. Jonah 4:6-8
Once again Jehovah God asked Jonah if he was rightly angry, this time over the death of the bottle-gourd plant. Instead of repenting, Jonah justified himself, saying "I have rightly become hot with anger, to the point of death." The stage was now set for Jehovah to drive home the lesson. Jonah 4:9
God reasoned with Jonah, saying that the prophet was feeling sorry over the death of a mere plant that had grown overnight, one that Jonah neither planted nor caused to grow. Then God concluded "For my part, ought I not feel sorry for Nineveh the Great city, in which there exist more than one hundred and twenty thousand men who do not at all know the difference between their right hand and their left, besides many domestic animals." Jonah 4:10,11 Do you see the depth of Jehovah's lesson? Jonah had done nothing for this plant, yet Jehovah was the source of life for Nineveh.