What this means in terms of existence, is a duality - the energy of our minds exists in two places at once, both here and now and back at the very beginning of the universe. It has been said that our universe is just a thought in the mind of God. None that our present day science and technology can detect. There is, however, a small grain of scientific support for one aspect of this puzzle. Electricity is energy.
Pure energy travels at the speed of light.
According to scientists then, and because of the General Theory of Relativity, any intelligence that was pure energy would experience the whole lifetime of our universe in an instant. Space and Time would indeed be transcended. But at the end of the day, at our present stage of scientific knowledge, real proof can only be manifested within an individual who has experienced these phenomena. It is a proof personal to that individual and has no value to science. For the rest of us, in the absence of proof, there is always faith and perhaps the words of one NDE survivor.