"The pure man of the left detests being, always preferring, in principle, in the words of Rousseau, what is not to what is. [footnote by J.M.: "What is not is the only thing that is beautiful," said Jean-Jacques Rousseau. And Jean-Paul Sartre: "The real is never beautiful."] The pure man of the right detests justice and charity, always preferring, in principle, in the words of Goethe (himself an enigma who masked his right with his left), injustice to disorder. Nietzsche is a noble and beautiful example of the man of the right, and Tolstoy, of the man of the left. (pp. 21-22.)"
Maritain is of course speaking of ideal types. No sane political philosophy could be purely leftist or purely rightist in the above senses. But it is useful to have the extremes of the spectrum so clearly delineated, especially since political opponents love to paint each other as extremists.