Sure, fokiao2, but what you are describing isn't "god", and that isn't this ontological "hidden truth of all things". Calling it "Ultimate Reality" makes things out to be way more complicated than they are, and the term get a lot of abuse in the Buddhist world, especially when it is combined with advaitaist notions of nonduality and even more when combined with later misrepresentations of the Dhamma that claim that it is metaphysical and concerns "the supernatural".