Who Is Ken Wilber? :

Wilber likewise approaches all the other fields of human knowledge: art to poetry, empiricism to hermeneutics, cognitive science to meditation, evolutionary theory to idealism. In every case he assembles a series of sturdy and reliable, not to say irrefutable, orienting generalizations. He is not worried, nor should his readers be, about whether other fields would accept the conclusions of any given field; in short, don't worry, for example, if empiricist conclusions do not match religious conclusions. Instead, simply assemble all the orienting conclusions as if each field had incredibly important truths to tell us. In other words, assemble all of the truths that each field believes it has to offer humanity. For the moment, simply assume they are indeed true.