I am amazaed that God apparently didn't require that Jonah agree with the message. If we wait until we are in full harmony with God's ways and message, we will never pass on His message. There is nothing hypocritical about faithfully presenting God's truth regardless of our opinion of it. The faithful message bearer will also choose to live the message despite the conflict he initially has with it. As he chooses the route of obedience he will discover that eventually the message will be reflected in his opinions and preferences.
Obedience always leads to a change of heart.
This didn't happen to Jonah because he refused to live his message. So, like Jonah, I want to deliver God's message even if I don't endorse it. Thou art a gracious God, and merciful, slow to anger, and of great kindness, and repentest thee of the evil. No doubt he had been taught that as a child. Surely he had seen it in his study of Israel's history.