Following from that… I randomly opened Philosophical Investigations at the point at which he says that language sometimes operates like an engine over-running in neutral (he was also a mechanic). At that point philosophy becomes necessary to bring it back into engagement. The standard reading would be that Wittgenstein sees the disengagement as detrimental. I'm not sure about that, as I haven't read enough. It could be that the free-play of language disengaged is in fact a good example of the moment in which duration is expressed, as Bergson described.