"Materialistically bound, traditional science assumes that anything that cannot be measured, tested in a laboratory, or probed by the five senses or their technological extensions simply doesn't exist. It's "not real." The consequence: all of reality has been collapsed into physical reality. Spiritual, or what I would call nonphysical, dimensions of reality have been run out of town.... This clashes with the "perennial philosophy," that philosophical consensus spanning ages, religions, traditions, and cultures, which describes different but continuous dimensions of reality. These run from the most dense and least conscious - what we'd call "matter" - to the least dense and most conscious, which we'd call spiritual. ... "Where's the proof of this Greater Reality?" you ask. I offer only an analogy: A battery of scientists can get together and tell you about all the scientific proof for the fact that bananas are bitter. But all you have to do is taste one, once, to realize that there is this whole other aspect to bananas. Ultimately, proof lies not in intellectual arguments, but in being touched in some way by the sacred within and without. Eckhart Tolle masterfully opens us to that possibility."