These ponderings attempt to let themselves be appropriated by the event. (Beiträge zur Philosophie (Vom Ereignis), Martin Heidegger, 1936–38/1989)
https://en.wikipedia.org/wiki/Stages_on_Life%27s_Way
https://en.wikipedia.org/wiki/S%C3%B8ren_Kierkegaard
Now, Bohr loved this one.