। ॥ । ॥
In plain words
That is the principal Heart, and in it all this rests. It is the mirror of all things and the treasury of all riches. For all living beings, it is awareness that is called the Heart, not some portion of a limb of the body, inert as a worn stone.
Word for word
That indeed is the principal Heart; in it this rests. It is the mirror of things, it is the treasury of all riches. Of all living beings, awareness is called the Heart; not one part of a limb of the body, like an inert, worn stone.