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The following is from RSRH's commentary on Devorim 6:9
<font face="Arial, Helvetica" size=3><b><i>And write them upon the
[door-]<br>
posts of your house and upon your gates.<br><br>
</i></b></font><font face="Arial, Helvetica" size=3>The
</font><font face="Arial, Helvetica" size=3><i>mezuzah
</i></font><font face="Arial, Helvetica" size=3>is not an amulet; in and
of itself, it does not protect the<br>
house. Only insofar as they shape their lives in accordance with the
</font><font face="Arial, Helvetica" size=3><i>mezuzah</i></font>
<font face="Arial, Helvetica" size=3>’s<br>
content can the people within the house expect help and protection<br>
from God, the “All-Sovereign and All-Sufficing,” in all the
vicissitudes<br>
of domestic life. With this intent it is our custom to adorn the<br>
outside of the </font><font face="Arial, Helvetica" size=3><i>mezuzah
</i></font><font face="Arial, Helvetica" size=3>with the Name
<i>shin-daled-yud</i>.</font></body>
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