Not everything that can be extracted appears in anthologies of quotations in commonplace books or on the back of Celestial Seasonings boxes. Only certain sorts of extracts become quotations.
An anthology of quotations is a museum of utterances.
The attribution of a speaker is in fact a part of the quotation. Some statements simply are better if a certain famous person said them.
I wonder if "an" ever occurs before "haughty" except in a quotation or whether you can make anything sound like a quotation by adding a word like "goeth"?
A single gnomic line can come to resonate with centuries of subsequent wisdom.
We sometimes think of quotations as extracts from larger texts but some quotations originated complete unto themselves.
Some lines are born quotations some are made quotations and some have "quotation" thrust upon them.