They can create miracles if utilized correctly. A very knowledgeable person who lacks courage will not go far. A scared leader will inspire no one. He or she will stay invisible. Knowledge is important, but courage is crucial. Courage without knowledge leads to unintended consequences. Courage and knowledge are twins and they are essential to each other.
Courage entails action. Knowledge is not power. The execution of knowledge is power. They teach students from primary schools till completing PhD programs to accumulate vast knowledge, but not how to execute this knowledge. The result is few entrepreneurs and billions of job seekers.