What does taking chestnuts from the fire tell us?

Taking chestnuts from the fire is a metaphor for being used, taking risks but getting nothing. Tell us that you can't eat hot tofu in a hurry, and there will be no pie in the sky. Chestnuts can be roasted and eaten with fire. Pay attention to ways and means, and don't take ill-gotten gains. Everything in the world can be enlightened.

Idiom:

Idioms are stereotypes in Chinese vocabulary. Idioms, everyone says they have become words, and so do idioms. Idioms are mostly four-character, and some are three-character, five-character or even more than seven-character. Idiom is a major feature of traditional culture in China, which has a fixed structure and a fixed sentence, indicating a certain meaning. It is applied to a sentence as a whole, with subject, object, attribute and other components. A large part of idioms are passed down from ancient times and represent a story or allusion. Some idioms are just a miniature sentence.