Well - kept false paths ...

'Teaching philosophy involves the same immense difficulties as instructions in geography would if the pupil brought with him a mass of false and falsely simplified ideas about the course and connections of rivers and mountains.
     'People are deeply embedded in philosophical, i.e. grammatical, confusions. And to free them from these presupposes pulling them out of the immensely manifold connections they are caught up in. One must, so to speak, regroup their entire language ...
     'Language contains the same traps for everyone; the immense network of well-kept false paths. And thus we see one person after another walking the same paths, and we know already where he will make a turn, where he will keep on going straight ahead without noticing the turn, etc., etc. Therefore wherever false paths branch off I should put up signs which help one get buy the dangerous places.'

—Wittgenstein, 'Big Typescript,' p. 423.