Tell me, what does the phrase "you need to go back to the furnace and rebuild" mean?

It should be said that you have some shortcomings that you shouldn't have, which makes the other party find it difficult to change, so you say to go back to the furnace and rebuild. Because of this, you can start over and let your shortcomings disappear. This sentence is usually used to tease each other, but it is also derogatory and a bit disgusting.

Related examples:

1, only people who can't figure it out, there is no road that can't be taken.

2. Success means standing up more often than falling down.

3. The body without soul is dead, and the confidence without behavior is dead.

Blame failure or timidity on others, and you will lay the foundation for a successful life in the future.

5. At the peak of my career, a stream with sweat flies by; In the pearl of wisdom, the light of hard work shines.

6. Truth is the highest state of life.

7, learning must be like a bee, picking a lot of flowers, in order to brew honey.

8. To give up the "victim psychology", we must first see the positive side of everything and everyone.

9. There is no mountain that can't be turned over, no desert that can't be walked out, and no self that can't be surpassed.

10, true courage includes two aspects: one is to fight against things that should not be afraid, and the other is to be afraid of things that should be afraid.