Deuteronomy 6:8 "And they shall be for symbols between your eyes"

From the age of thirteen, Jewish boys are commanded to put on Tefillin every weekday, expressing their dedication and love for HaShem.

Tefillin are square leather boxes containing parchments upon which portions of the Torah are hand-written by a scribe.

They are worn on the head showing that our thoughts should be connected to HaShem, just as the tefillin are tied onto us.