actually there are at least four dimensions (duration) and string theory postulates many more, possibly an infinitude of dimensions available in the physical world. I don't think the holy spirit is really a hebrew concept, is it? What amazes and amuses me is the sophistical gymnastics the "church fathers" (Athanasius particularly) indulged to justify a multiplicity of deities in a "monotheistic" cult. It's a "mystery" indeed.