John Niemeyer Findlay 
Discipline of the Cave (Routledge Revivals) [PDF ebook] 

First published in 1966, The Discipline of the Cave is the first series of a course of Gifford lectures on philosophical issues.. J N Findlay’s lectures use the image of the Cave to show how familiarity is full of restrictions, and involves puzzles and discrepancies unable to be resolved or removed. Such philosophical perplexities may be a result of the misunderstanding and abuse of ordinary ways of thinking and speaking. They may also be a way of ‘drawing us towards being’, providing proof of the absurdity of ordinary thought, speech and experience unless modified and added to in ways which may point beyond it. What may be called a mystical and otherworldly element may need to be introduced into or rendered explicit in all our experience in order to give a viable sense to the most commonplace human utterances and activities.