Einstein showed us through his elegant calculations and his theories of relativity that we live in a four dimensional universe. Our universe must be described not only in the three dimensions of the x y and z axis but must contain a representation of time as well. He showed that all of these dimensions, including time, were not absolute but mutable and could be stretched, compressed, and skewed when viewed from different perspectives. He also maintained that there was no right' or prime perspective which we could use as a base for our observations.
Einstein pointed toward an important truth about time but never seemed to fully grasp the ultimate implication. He continued to speak of time, as classic physics had, as a thing apart even though he had destroyed the idea of absolute time and replaced it with relative time. But time is truly, as Einstein postulated, one of the four dimensions of our universe and not unlike the other three.
If we see time as one axis of a four dimensional geometry we get a clearer, and startling, understanding of the temporal dimension. When we talk about an objects position in three dimensional space we say that it exists at a certain point in relation to the xyz axis. Yet every other possible location in that three dimensional matrix still exists and we can say other objects are located at other points and relate their positions to each other. If time is, as Einstein postulated, the forth dimension we must see it in the same way.
For the four dimensional geometry to work as it does in three dimensions every point in the matrix must exist. There can be no present' or past' or future' these are replaced by coordinates with the past being negative, the present zero, and the future positive, but all exist together. In three dimensional geometry just because an object is located at a negative position on the z axis (down) does not rule out the existence of other positive positions (up). In the same logic Just because Einstein wrote his theories in the past (negative T) and we live in the present (zero T) that the future does not yet exist. The "Yet" here is a relative term.
Temporal coordinates that are positive to us, from our frame of reference, are in our future but they must already exist because there can be no preferred frame of reference, as Einstein pointed out. So by this logic all time exists as all space exists. There is no true distinction between past and future other than their relative position in four dimensional space-time.
Einstein understood this even though he never articulated it in his scientific papers. In his philosophy he believed in strict determinism and predestination. He believed there was no free will' either personally or on the sub atomic level. Everything in the universe behaved according to strict determinism. The universe was set and unchangeable. But he never put this philosophy into scientific theory, though it colored all of his ideas. It was his adherence to strict deterministic ideals that made him reject the random nature of quantum theory.
I will discuss the implications of this in a future article on Light Quanta. For now I propose a new postulate, the 'Conservation of Time'. All time exists, there can be no new time created nor can it be destroyed. The past is not gone and future already exists