No prophet preached a more painful "reality sermon" than Hosea. He was instructed to marry a prostitute named Gomer who subsequently bore him three children, and he wasn't even sure the last two children were fathered by him. Then Gomer left him for another man, and Hosea had the humiliating responsibility of buying back his own wife.
What was this all about? It was a vivid picture of what the people of Israel had done to their God by prostituting themselves to idols and committing "spiritual adultery."