Her German letters were mixed with numerous French words and whole passages in French, for example when she replays conversations with Louis XIV, with her husband Philippe or other people. Johannes Kramer describes her letters as "the best studied example of the use of the German language in private letters between members of the high nobility". Liselotte tended to use coarse formulations, which was not uncommon in letters from princely persons of the 16th and 17th centuries, but in Helmuth Kiesel's view she had gone extraordinarily far in this, including a psychological disposition, the frivolous tone in the Palais Royal and perhaps her previously reformed faith had contributed to polemics known to her; in any case, their tone differed greatly from the "Précieuses" of the Parisian salons of their time, and also from the naturalness of the German bourgeois lettering style of the 18th century, as shaped by Christian Fürchtegott Gellert. She liked to draw striking comparisons and often interwoven proverbs or appropriate sentences from plays. Her favorite saying (and personal motto) is often quoted: "What cannot be changed, let go as it goes" ("Was nicht zu ändern stehet, laß gehen wie es gehet")