Below the bottom of the heart and above the top of the mind

 1. Below the bottom of the heart and above the top of the mind, it’s the ultimate dimension of the soul or in other words, the kingdom of gods. 

2. The ultimate dimension of the soul is the source of the heart and the mind.

3. In this ultimate dimension of the soul, there is nothing as everything is thing-in-itself. So, the heart and the mind are heart-in-itself and mind-in-itself here.