What do they mean when they say 'It is a fearful thing to fall into the hands of the Living God?'?

[Jamaica]

Please tell me, what does it mean to 'fall into the hands of the Living God'? And why do they call it 'fearful?' This scripture is often used implying a negative outcome.

[Minajah]

this should explain it

Luk 12:4 And 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.
Luk 12:5 But 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.