Metaphysical guilt is the lack of absolute solidarity with the human being as such—an indelible claim beyond morally meaningful duty. This solidarity is violated by my presence at a wrong or a crime. It is not enough that I cautiously risk my life to prevent it; if it happens, and if I was there, and if I survive where the other is killed, I know from a voice within myself: I am guilty of being still alive.
— Karl Jaspers, 1946