I would like to quote Kensho Furuya: "Human beings are afraid of what they don't know."
I have found this statement to be remarkably true. Why are people afraid of public speaking? They don't know the reaction the crowd will give them. Why are people afraid of death? Because, though they say they have faith, they still don't know what lies beyond the realm of life.
"Why are you afraid? Have you still no faith?"