It means that real gold will not change color when burned at 1000 degrees. As long as it is really mellow wine, even if it is hidden in a deep alley, people will be attracted by its fragrance.
The truth is: people with real talent and learning will not be buried. If they are excellent, someone will naturally come to you.
The physical principle is diffusion phenomenon. The molecules of all substances are moving irregularly endlessly. Alcohol molecules can spread from the depths of alleys to far places, making people smell.