Run away from experts who have all the answers

 

"An expert is someone who doesn't want to learn anything new, because then he would not be an expert."  - Harry Truman 

Truman is right. Show me an expert and I will show you someone who does not want to be wrong and cannot utter the words, "I don't know".  The true expert in inquisitive and will admit what he does not know and spends time searching for the deeper answers. 

Form a simple test. Ask an expert what he does not know about his field of expertise. If he does not have a long list of what he does not know or what he needs to learn more about, then you should walk away. For everything he does know, the expert should also admit to what he still must work on.