This image is a quick response (there could be so much more to it, and so many other ways to do it) to this wonderful old Hasidic tale I found in A Hidden Wholeness this morning:
"The pupil comes to the rebbe and asks, 'Why does Torah tell us to 'place these words upon your hearts'? Why does it not tell us to place these holy words in our hearts?'
The rebbe answers, 'It is because as we are, our hearts are closed, and we cannot place the holy words in our hearts. So we place them on top of our hearts. And there they stay until, one day, the heart breaks, and the words fall in.'"
What a perfect explanation for all those concepts we have in our heads that just don't seem to have planted themselves yet in our hearts...