This is the HTML inside the mobi file, retrieved through mobi unpack:
Code:
<blockquote height="1em" width="1em" align="center">
<font color="#444">
and carried our sorrows;
</font>
</blockquote>
and the one without the paragraph indent:
Code:
<blockquote height="2em" width="0pt">
<font color="#444">
Surely he has borne our griefs
</font>
</blockquote>
It's definitely center aligned.