To make quoted bits of text stand out, you can use BlockQuotes within your tiddlers, like this:

JeremyRuston said:
<<<
A TiddlyWiki is like a blog because it's divided up into neat little chunks, but it encourages you to read it by hyperlinking rather than sequentially: if you like, a non-linear blog analogue that binds the individual microcontent items into a cohesive whole.
<<<

Like BulletPoints and NumberedBulletPoints, you can have multiple levels of BlockQuotes. Just edit this tiddler to see how it's done.

>level 1
>level 1
>>level 2
>>level 2
>>>level 3
>>>level 3
>>level 2
>level 1