Testimony of Shechina:

The Tefillin serve as a testimony that the Shechina resides on the Jewish people.[1] The Shelah Hakadosh[2] states as follows: After the destruction of Temple the Shechina continues to reside on the Jewish people in merit of the Tefillin. This is based on the Zohar[3] which states that through wearing the Tefillin one fulfills the verse of “Make me a Mikdash and I will dwell on them.”

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[1] Menachos 35b

[2] Mitzvas Tefillin

[3] Chayeh Sara 129a