When you use > to make a quotation block, if you stack them together like this

>This is text.
>This is more text.
>Text is a noun for the written word, not a verb for messaging on cellphones ya dang teens!

It will render on one line within the blockquote like this:

[This is text. This is more text. Text is a noun for the written word, not a verb for messaging on cellphones ya dang teens!]

Using the HTML <blockquote> and <br> tags, I can get it to render as:

[This is text.
This is more text.

Maybe you'll like this much more subjective rule better:

"11. —Good English is the English used by the best speakers and writers; and the use of such English is 'Only a phrase of good manners.' Bad English, that is, English unlike that which is used by well-informed and careful writers, produces in the mind of a well-informed reader an impression of vulgarity or ignorance similar to that which we get from seeing a person eat with his knife. It is with language as with clothes and conduct. Persons who wish to be classed as cultivated people must not only dress and act like cultivated peopl…