“If you only do what you can do, you will never be more than who you are now."

"He who fights with monsters should look to it that he himself does not become a monster. And if you gaze long into an abyss, the abyss also gazes into you."

"The future influences the present just as much as the past."

"The man of knowledge must be able not only to love his enemies but also to hate his friends."

"Madness is rare in individuals but in groups, parties, nations, and ages it is the rule."

"There are no beautiful surfaces without a terrible depth."