"No one lies so boldly as the man who is indignant"

This quote by Friedrich Nietzsche recommends that people who are mad are more likely to lie than those who are not. This could be because when someone is upset, they are most likely to be passionate and emotional about their beliefs, and for that reason more likely to be deceitful in order to defend them. It might likewise be because when somebody is mad, they are more likely to be desperate to show their point, and for that reason more likely to depend on order to do so. This quote implies that people who are indignant are most likely to be dishonest in order to protect their beliefs and viewpoints, and that they are most likely to lie boldly in order to do so.