Whereof one cannot speak, therefore one must be silent.
––Ludwig Wittgenstein
I don't know if anyone has wondered about the fact that Wittgenstein's Tractatus Logico-Philosophicus is structured around seven basic propositions. Wondered about the seven, that is. Why seven? Is it that there is some natural attraction of people to this number? Did Wittgenstein say to himself beforehand, "There must be seven," or did it just happen to be the case?
It is his seventh proposition that catches my attention. His first is interesting, "The world is everything that is the case," or "The world is all that is the case."