These ponderings attempt to let themselves be appropriated by the event. (Beiträge zur Philosophie (Vom Ereignis), Martin Heidegger, 1936–38/1989)
https://www.amazon.com/Boundary-Autobiographical-Sketch-Paul-Tillich/dp/1620322927
https://archive.org/details/onboundaryautobi0000till/page/n7/mode/2up
https://www.perlego.com/book/1724470/on-the-boundary-an-autobiographical-sketch-pdf