The whole problem with the world is that fools and fanatics are always so certain of themselves, and wiser people so full of doubts.

Summary

This quote suggests that those who are foolish or fanatical tend to be overly confident in their beliefs, while wise individuals are often plagued by doubts. The world's issues emerge from the fact that those who are strongly convinced of their ideas can be unwilling to consider alternative perspectives or admit their own fallibility. Conversely, wiser individuals recognize the complexity of the world and the limitations of their own knowledge, leading them to approach situations with more skepticism and a willingness to question.