'Let me start by laying my cards on the table. I’m the son of a missionary. My father’s parents were atheists and scientists. He, in adolescent rebellion, became a Christian; I, ditto, became an atheist.'
A short article on Koestler's motivations:
@v4169sgr Thank you.
@cyrilpedia
Well worth a re-read, in my opinion.
I used to teach some of this stuff: while Arthur certainly did have some idiosyncrasies, not only is his grasp of the detail impressively solid (for the time and the references he had) but his view on how religion and science intertwined such that the separation between them was gossamer-thin in the time of Pythagoras, and again in the during the life of Kepler, is very thought-provoking.