"A fellow who is always declaring he's no fool usually has his suspicions"

This quote by Wilson Mizner recommends that someone who is continuously announcing that they are not absurd is likely to have doubts about themselves. This could be translated as a warning versus overconfidence and arrogance. It implies that somebody who is too sure of themselves may be missing something essential. It could also be translated as a suggestion to be modest and to recognize that nobody is best. It is very important to be knowledgeable about our own restrictions and to be open to learning from others. This quote motivates us to be honest with ourselves and to recognize that all of us make mistakes. It is essential to be knowledgeable about our own weaknesses and to be ready to gain from them.