Discontent!
The unhappy prophet, who ran away from his responsibilities and came back from the mouth of the whale to see thousands saved by his preaching in the city of Nineveh and yet he was upset because of what they had done and could not get over it?
God gave him comfort in his pain by the relief of the tree, but with no change He took it from him to show His power at work in the world with humanity!
There is much that we can learn from this account, that when God asks us to do something we should obey and not get caught up in ourselves and all the woes and anger of our hearts!
Jonah 4:7, Matthew 6:12, Mark 6:19, John 20:23.