What is the heart?

What is the heart ❤️

 1. The heart is a thing, in which space will dwell.

2. The heart is like a potter, the heart can be made as hard as it wants to be. But the biggest hardship in the world is the hardship of the heart, whoever can handle the hardship of the heart can conquer the world.

3. To build the heart, you have to know yourself.