Intuition of the Oneness...

It is from the more or less obscure (mystical) intuition of the oneness that is the ground and principle of all multiplicity that philosophy takes its source. And not alone philosophy, but natural science as well. All science, in Meyerson's phrase, is the reduction of multiplicities to identities. Divining the One within and beyond the many, we find an intrinsic plausibility in any explanation of the diverse in terms of a single principle....... (Aldous Huxley, The Perennial Philosophy)