"It takes no effort to find a place even if you wear out iron shoes." It means: when I was looking for it in the past, I couldn't find it even though the iron shoes on my feet were worn out, but I didn't expect that it didn't take any effort later. You will find it with your own strength; it means that you spend a lot of effort to find something you urgently need, but you get it inadvertently.

Pinyin: tà pò tiě xié wú mì chù, dé lái quán bú fèi gōng fū?

Source: Ming Dynasty Feng Menglong's "Warning to the World·Jin Ling Shi's Beautiful Maid Repays the Showman" : "Jin Man closed the door, and the two of them sat down to talk in detail.

It's exactly this: there is no place to be found after wearing iron shoes, and it takes no effort to get it! ”