Once upon a time, a king told his men to search for a simple way through which people could learn wisdom.
The king’s men scattered around the world to find it. After years of searching, they had gathered thousands of books that taught wisdom to people. But when the king looked at the large mound of books, he said,
“It would take a whole lifetime to read these books. I need something much simpler than this.”
So the king’s men selected the top 100 books, but still he was not satisfied. Then they narrowed it down to 10 books, but the king was still not satisfied.
Finally a single book was selected. Again the king asked them to narrow it down—first to a chapter, then to a page, then to a paragraph, and at last to just one sentence. For a long time the men searched for the single sentence of wisdom that would satisfy the king. The sentence they finally chose was this:
"There ain't no such thing as a free lunch."
It means that you must pay a price to get what you want in this world.