The sentence begins "To paraphrase..." meaning the author was not quoting Jefferson, he was paraphrasing him.

Whenever a writer clearly states that he is "paraphrasing" he open admists he is not quoting the source and deliberately re-writing a famous quote to make a point.

Paraphrasing allows writers to examine the meaning of others’ work, creatively rephrase their statements, and craft information to suit an essay or composition’s goal or focus.