The Lord said to him, “This plant grew up in one night and disappeared the next; you didn't do anything for it and you didn't make it grow—yet you feel sorry for it!
After the sun had risen, God sent a hot east wind, and Jonah was about to faint from the heat of the sun beating down on his head. So he wished he were dead. “I am better off dead than alive,” he said.
For the sadness that is used by God brings a change of heart that leads to salvation—and there is no regret in that! But sadness that is merely human causes death.