karl:

Use the quote block to typeset quoted text.

Let us change our traditional attitude to the construction of programs: Instead of imagining that our main task is to instruct a computer what to do, let us concentrate rather on explaining to human beings what we want a computer to do.

The practitioner of literate programming can be regarded as an essayist, whose main concern is with exposition and excellence of style. Such an author, with thesaurus in hand, chooses the names of variables carefully and explains what each variable means. He or she strives for a program that is comprehensible because its concepts have been introduced in an order that is best for human understanding, using a mixture of formal and informal methods that reinforce each other.

— Donald Knuth

A short one:

Everything should be made as simple as possible, but not any simpler – Albert Einstein

In a verse environment, there is an implicit line break at the end of each line, and indentation and vertical space are preserved:

Everything should be made as simple as possible,
but not any simpler – Albert Einstein

Typically used for quoting passages of an email message:

>> This is an email message with "nested" quoting. Lorem ipsum dolor sit amet,
>> consectetuer adipiscing elit. Aliquam hendrerit mi posuere lectus.
>> Vestibulum enim wisi, viverra nec, fringilla in, laoreet vitae, risus.
>
> Donec sit amet nisl. Aliquam semper ipsum sit amet velit. Suspendisse id sem
> consectetuer libero luctus adipiscing.

Itemized or unordered lists (ul):
- This is the first list item.
- This is the second list item.

Enumerated or ordered Lists (ol):
1. This is the first list item.
2. This is the second list item.

Maybe an equation here?

See http://www.google.com/ for more information…