However, there are a few phrases that could be considered mottos, depending on your interpretation:
* "Who watches the Watchmen?" This is a recurring question in the comic, reflecting the theme of power and accountability. It could be seen as a motto questioning the very nature of heroism and authority.
* "Nothing ever ends." This line, spoken by Dr. Manhattan, sums up the cyclical nature of violence and the futility of trying to achieve lasting peace. It could be interpreted as a dark and cynical motto about the human condition.
* "The world's smartest man is a fool." This quote, also from Dr. Manhattan, speaks to the limitations of intelligence and understanding in the face of complex human emotions and actions. It could serve as a reminder of the fallibility of even the most powerful beings.
Ultimately, the "motto" of Watchmen depends on the individual reader's interpretation of the story and its themes.