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Tefillin and Mezuzot
The Kashruth of letters formation etc. in Tefillin and Mezuzot, requires tremendous halachic knowledge, expertise and judgement. Inside the Tefillin and Mezuzot are parashiot from the Torah, Sh'ma and ve-Haya Eem Shamoa, that contain the purest simplest form of emuna (faith) in God. Emuna in God is the purpose for every soul.
Tefillin and Mezuzot are mitzvot that need to be written with the highest cavana (intention) and hidurim, both halachic wise and precise hand writing. God looks at the person's heart. Acquiring Tefillin and Mezuzot from a certified Levy, a descendant of Moses, whose heart is solid in the long-lasting never ending relationship between God and the Levyim, is the gateway for fulfilling these precious mitzvot with finding favor in God's eyes, just as God announced "ve-Hayu Lee ha-Levyim" (and The Levyim [Hearts'] Are For Me).