The Rambam teaches that the mitzvah of mezuzah is not only about placing it on the doorpost, but about the lasting impact it has on us. Each time we pass it, the mezuzah reminds us of Hashem’s oneness, our love for Him, and pulls us away from life’s distractions. While tefillin and tzitzit inspire mainly when we are wearing them in moments of holiness, the mezuzah works constantly—especially as we leave home and enter the noisy, distracting world—serving as a silent guardian that keeps our connection to Hashem alive wherever we go.

לקו״ש כט-ב