Exploring the mitzvah of tefillin offers us a chance to appreciate one of the most profound positive commandments in the Torah. Tefillin are called an אות (a sign) testifying to our mission as Jews and our eternal covenant with God. Tefillin serve to remind us of such fundamental concepts as God’s Unity, His Providence, reward and punishment, and the Exodus from Egypt. But above all, tefillin are a symbol of the unique bond that exists between God and the Jewish People.