WHO IS THIS TO FEAR AND WHY?

 Luke 12 was my daily read today. so
WHO IS THIS ONE THAT SHOULD BE FEARED?

⁴And I say unto you my friends, Be not afraid of them that kill the body, 
and after that have no more that they can do.

⁵But I will forewarn you whom ye shall fear: 
Fear him, which after he hath killed hath power to cast into hell; yea,
 I say unto you, Fear him. 

AND IS THIS WHOM MOST CHRISTIANS REALLY FEAR or is their fear
as baseless as that of the parents of the formerly blind man-----JOHN 9,22

pax vobiscum