This title has two true meanings. The gospel is the only way to know how to be forgiven, and the gospel is not a chargeable product. It has been given freely, although at great cost to Jesus, and is to be passed on freely. The Corinthian church had been told by false teachers that Paul's gospel was worthless because he did not charge a fee for teaching it, and he paid for everything he needed. Surely, they would have argued, if the gospel was so wonderful it would have a big price tag, and Paul's wealth would have proved that the gospel was the unique Word from God.