Written over the last 18 months of his life and inspired by his interest in G. E. Moore's defence of common sense, this much discussed volume collects Wittgenstein's reflections on knowledge and certainty, on what it is to know a proposition for sure.

Granted a certain depth of accuracy in citing an aspect of Spengler as an enactment of an aspect of Wittgenstein's thought, Wittgenstein's difference from Spengler should have depth. One difference can be characterized by saying that in the Investigations Wittgenstein diurnalizes Spengler's vision of the destiny toward exhausted forms, toward nomadism, toward loss of culture, or of home, or community: he depicts our everyday encounters with philosophy, with our ideals, as brushes with skepticism, wherein the ancient task of philosophy, to (...) awaken us, or bring us to our senses, takes the form of returning us to the everyday, the ordinary, every day, diurnally. (shrink)