Superficial and shallow knowledge always leads to dangerous consequences. An incompetent doctor or surgeon may play with the lives of his patients; a teacher with shallow knowledge of his subjects will misguide his students; a lawyer without a thorough knowledge of the law will ruin his clients; similarly, an inefficient engineer will build bridges and buildings that could cause major accidents. These people expose others’ lives to serious risks. They are so conceited that they never realize their shortcomings and, hence, make no progress. We can find such people in every walk of life, whether in art, science, literature, economics, or medicine, and these are hazards for the common people. One must, therefore, never rely on persons who are not thorough in their profession or vocation and be cautious when dealing with such fellows.