People should be wary of those who quote which author? In the anime Psycho Pass they reference some of the major ideologically leading people.

But there is a direct quote from one of the main characters saying "Be wary of those who quote ___"  There is then a reply: "Had you not quoted him I probably would have." Who is the author in question?
From episode 16 - The Gates Of Judgement (at around 16:10), Shogo Makishima said:


  Justice is subject to dispute; might is easily recognized and is not disputed. So we cannot give might to justice,


In return, Shinya Kogami replied:


  I have long since learned, as a measure of elementary hygiene, to be on guard when anyone quotes Pascal.


So the answer is Blaise Pascal.

By the way, Kogami's reply is actually a quote from Toward a Philosophy of History by José Ortega y Gasset.