Before you can understand the above statement, you have to understand the heart
There are several possibilities
- Something that is emotional
- The heart in the left of the chest
- The hridaya chakra in the right of the chest
- Anahata chakra in the center of chest
- The heart of shiv.
Obviously it is not 1 or 2 or 4.
I suspect he refers to the heart of shiv
Where is this located? How do I know I reached there
If you have reached there you would not have these questions.
Even if that knowledge is shared, it is unlikely to be of benefit. You have to reach there not just imagine it.
Bhavin