Why Don’t We Wear Tefillin on Shabbat?

Tefillin and Shabbat Tefillin are a daily mitzvah of immense holiness. Yet we do not wear them on Shabbat or Yom Tov. Halacha goes even further and prohibits wearing them on these sacred days. Why does a holier day remove the need for such a sacred mitzvah? The answer lies in the concept of the…