Everyone is scared I have a feeling in my heart. Which indicates that we are normal. The fear is that mark twain said that we must fight to overcome a person with courage.
Everyone surely has never been afraid of or have feelings of fear, in which shows that we have the normal fear is something Mark Twain tells us that we must struggle to overcome brave people.
They all have had fear or feel fear in his heart, to show that we are normal, The Fear is what Mark Twain told me that we had to fight to win over those who have the courage.