Chazal tell us Aharon was rewarded with the Urim Vetumim on the Lev, partly because he was Sameach with a full Lev when Moshe was made the leader of Yisrael. Some thoughts from Rav Elya Baruch about the concept of Midah Kneged Midah on a specific part of the body.
Thank you for listening.
Have a wonderful Shabbos and a Freilichen Purim