A paraphrase is a restatement, in your own words, of a passage of text. Its structure reflects the structure of the source passage.
Paraphrases are sometimes the same length as the source passage, sometimes shorter.
Behrens A quotation uses the exact words of the original. To maintain a passage which is particularly well-written. Do not quote facts available in a wide variety of sources, or your own independent ideas or primary research. Obviously, you must know the audience. Common knowledge can be facts or interpretations.