Søren Kierkegaard was a Christian author who was against applying the ideas of the Scientific Enlightenment to Christianity. He lived in Denmark from 1813 to 1855. His works were written to the single individual who might be interested in reading them.
Soren wasn’t so afraid of sin as he was of the consequences for any individual, like his own father, who at 82 years old couldn’t forget what he had done 70 years earlier, and couldn’t believe he could be forgiven. As far as Regine goes he had good reasons to break off his engagement and explained them in his book Prefaces.
“The invisible Church is not a historical phenomenon; as such it cannot be observed objectively at all, because it is only in subjectivity.” Soren Kierkegaard, Concluding Unscientific Postscript p. 54 (1846) Subjectivity is truth.
For many days I had been debating within myself many and diverse things, seeking constantly, and with anxiety, to find out my real self, my best good, and the evil to be avoided, when suddenly one—I know not, but eagerly strive to know, whether it were my-self or another, within me or without— said to me:
It was as alien as it could possibly be to my nature to want to terrify others, and therefore I both sadly and perhaps also a bit proudly found my joy in comforting others and in being gentleness itself to them-hiding the terror in my own interior being. So my idea was to give my contemporaries (whether or not they themselves would want to understand) a hint in humorous form (in order to achieve a lighter tone) that a much greater pressure was needed-but then no more; I aimed to keep my heavy burden to myself, as my cross. I have often taken exception to anyone who was a sinner in the strictest sense and then promptly got busy terrifying others.