Free lunch

Isaiah 55:1 - "Come, all you who are thirsty,
come to the waters;
and you who have no money,
come, buy and eat!
Come, buy wine and milk
without money and without cost."

I wonder if there was a common saying like, "There's no such thing as a free lunch" in Isaiah's day. In this verse, God is offering a "free lunch" to everyone. It's free to us because the price was paid in full by someone else. Jesus paid the fare, the tab, the bill because there's no way we could. No amount of dish washing could ever have covered the cost. But since Jesus did step in, we can "delight in the richest of fare" -- heaven -- forever.