Often say work to heart, then "Heart" where?
In the "Leng Yan Jing" There is a part of the Buddha to Ananda about the heart where the wonderful inquiry, this is the famous "Seven Heart".
The heart is not in the body, not outside the body, not in the eye root, neither with the outside world, even if the assumption that the heart is not in any place is not right.
In fact, if you want to continue to cross-examine can break down more about the heart of the proposition.
There is a story about the two-dimensional kingdom being traversed by three-dimensional world objects. Although the inhabitants of the two-dimensional kingdom can see the "projection" changing, it is still impossible to understand exactly what the "that Thing" is. (Interested friends can look at the imagined four-dimensional space )
Therefore, the "heart" in the three-dimensional world can not accurately locate and express. To find out where the "heart" is, we must go beyond the three-dimensional bondage. And the way beyond, must not be purely material means.
Now find that the word "intentions" is so wonderful.
Observe the people around you, like the sushi master, who will focus on a belief, such as "make the perfect sushi".
This focus will shield the distractions around you, beyond time and space.
The right thing is to devote yourself (that is, to relax) and focus on a certain belief without distractions. "The heart is born without living."
This may be the real heart of the way.
Where is the heart? How to Heart