A friend of mine recommended this to me and its a tough one. Its along the lines of The Power Of Now, but it was written in 1968, the year I was born. Its complicated and a really hard read (it has to be read over and over, one chapter at a time) but its so worth it. Its an amazing education in the power of the mind and really fascinating that it was written so many decades ago. If it doesn't make you think, then nothing can.