This page illustrates the new quotation markup.
Our plan was perfect; it’s just our assumptions were wrong. — Ken Olson
Or if you prefer:
All models are wrong, but some models are useful. — George Box
Here is a slightly longer quotation, without an attribution:
Persistence is the hard work you do after you get tired of the hard work you have already done.
The left and right margins are indented an equal width. In the typeset version, notice that the inserted quote marks are “pulled”.