But it displeased Jonah exceedingly, and he was angry.
Jerome commends this grief of Jonah, and compares it to the holy zeal of Paul when he wished himself to be an anathema for his brethren, (Romans 9:3:) for he denies that he grieved because God had showed mercy to so illustrious a city; but because the conversion of the Gentiles was a certain presage of the destruction of the chosen people.
But it displeased Jonah exceedingly, and he was very angry. Jonah was "mirabilis homo", as one calls him, an "amazing man"; the strangest, oddest, and most out of the way man, for a good man and a prophet, as one shall ever hear or read of.
But it displeased Jonah exceedingly - This hasty, and indeed inconsiderate prophet, was vexed because his prediction was not fulfilled. He had more respect to his high sense of his own honor than he had to the goodness and mercy of God.