The belief that one knows everything is indeed a misconception that many have. In such cases, the individuals think they have a vast expanse of knowledge, and no one knows beyond that. However, knowledge is an ever-expanding ocean, and claiming that you have mastered it all is similar to standing on the shore and declaring you are the ruler of the entire sea.
Firstly, such people have arrogance. And this prohibits personal progress. When individuals consider themselves omniscient, they close the door to understanding other things; this takes them far away from new ideas, opinions, perspectives, or experiences. Also, this hinders learning, intellectual growth, and emotional development. True wisdom lies in exploring what remains unknown.
In addition, this opinion can lead to grave errors in judgment. Ignoring the expertise of others, refraining from critical advice, or coming to conclusions without thorough knowledge can lead to dire results. Our history has many such examples of leader and thinker whose belief that they know everything have led to disaster.
In short, acknowledging the limits of an individual’s knowledge is the beginning of genuine wisdom. By embracing humility and curiosity, it helps to open doors to a lifetime of learning and growth. So, the belief that you know everything is a big mistake that can lead to dangerous consequences and hinder personal growth. You should keep an open mind to welcome new thoughts and opinions for growth.