In On Certainty from 1949-1951, Ludwig Wittgenstein showed that there is no reasonable ground not to put one’s trust in what is groundless. The language game and the form of life on which our social and scientific evidence is based are without ground. They themselves cannot be grounded in reason. They reach into the groundless abyss. And therefore human beings are left with no other choice than to put their trust in this doubtful certainty which is indubitability itself. Indubitability is dubitable. It is a kind of problematic evidence. Like an invisible veil, it has laid itself over the abyss of chaos and namelessness. One could say that it merges with chaos since it is so inconspicuous, so efficient.