When you hear good news about how to escape from a common misery, you become a debtor to tell the good news to others so they can escape the misery too. You owe it to them. Because if you withhold the good news of grace from others, as if you were qualified for it, and they were not, then you show that you have never known grace. We don't qualify for it beforehand. So if you hold this grace back from others as if you are qualified and they are not, you default on your debt to the world and prove that you have not really known grace.
Grace is precious beyond words.
It is our only hope as sinners. We don't deserve it from God. And no one can deserve it from us. When it comes to us freely, we are debtors to give freely. Culture and intelligence and education do not qualify you for the gospel of grace.