Was studying a biblical reference to "phylacteries" located in Matthew 23:5. I researched this word in one of my favorite sources for such questions, that is at Chabad.org http://www.chabad.org/library/article_cdo/aid/142435/jewish/Wrapping-the-Mind-and-Heart.htm
They point out that Phylacteries, also known as "Tefillin" refers to the little boxes worn during morning prayers during the week. One is specifically strapped to the sleeve of the upper arm, exactly positioned so that when the arm is bent, reading, the box is right next to the heart.
These boxes are to bind with Mind and Heart with our deeds. Here's a direct quote from the instructions of how to put these on your head and sleeve:
"Focus on what you’re doing. From the time you make the blessing until both tefillin are in place, do not talk. Don’t even wink. Just concentrate on hooking up your mind, heart and deeds, and binding them to G‑d."
In conclusion, the Jewish person in prayer, wearing the tefillin, is "wearing his heart on his sleeve."
Or... is this just a fanciful coincidence.... You tell me...