Jonah 4: Remember God's Mercy

Jonah 4 concludes with a gut punch to the reader: why are we so quick to have mercy for ourselves and yet have frustration when God has mercy on others?  We quickly turn in to "older brothers" that despise the Father and our brothers.  
By remembering God's mercy to us and where we came from, we can join God in being merciful to the world around us.