[gcruse]

It'll be your belief that determines the knowledge available to you,

There's a book called Crack in the Cosmic Egg. that said something similar.

a mode of thinking through which imagination can escape the mundane shell of current construct reality and leap into a new phase of human evolution. 

Of course the failure of alchemy and astrology obliterate the thesis that reality is derived from desire.  Quantum physics and the collapse of probability waves make an interesting counterpoint, but all in all, the idea that reality springs from belief is so easily disproved I'm amazed sentient beings still cling to it.

[TigersEye]

Do you really believe that?

[RightWingAtheist]

Judging from the description, I'd say the author was tripping on some bad acid while reading Henri Bergson.

[William Terrell]

. . .but all in all, the idea that reality springs from belief is so easily disproved I'm amazed sentient beings still cling to it.

Actually the biggest part of your reality is your personal experience of objects and events. This is completely determined by your beliefs. In addition, whole segments of knowledge and perception of physical existence can be edited out of your reality by your beliefs.

This is not a theory. It's observable in its more dramatic form in feminists and socialists. Scam artists and confidence men depend on it.