There is something truly terrifying with someone who believes their actions are justified by heaven or by hell.
“What does the task look like in everyday life, for I continually have my favorite theme in mind: whether everything is indeed all right with the craving of our theocentric nineteenth century to go beyond Christianity, the craving to speculate, the craving for continued development, the craving for a new religion or for the abolition of Christianity. As for my own insignificant person, the reader will please recall that I am the one who finds the issue and the task so very difficult, which seems to suggest that I have not carried it out, I, who do not even pretend to be a Christian by going beyond it. But it is always something to point out that it is difficult, even if it is done, as it is here, only in an upbuilding divertissement, which is carried out essentially with the aid of a spy whom I have go out among people on weekdays, and with the support of a few dilettantes who against their will come to join in the game.”
Søren Kierkegaard (1813-1855), Philosopher, Concluding Unscientific Postscript