I remember seeing in a couple of places that the ideas behind inner game were first put forth by philosophers and a couple of books were recommended. Was it Sagan? Does anyone know which philosophers and books they were talking about? I can't find the post, thank you guys for the help.

Edit' thanks for the responses so far, looks like this is also an "are there any good books on pick-up" thread which I would also be interested in of you guys know of any good ones.