The abyss will eventually have a bottom, and three inches of people's hearts cannot be measured. Of course it can be used as a personalized signature. Personally, it's not bad.

With this sentence as your signature, you can see that you have some life experience and have been in society. Know that people are sinister and human nature is complex. An ulterior purpose is to describe people's hearts.

The abyss has a bottom, the human heart has no bottom, and the human heart changes at any time and is unpredictable.

It is your freedom to use which sentence as your signature. I can see from your signature that you are a little disappointed in human nature.