Einstein's quote, "The distinction between past, present, and future is only a stubbornly persistent illusion," is rooted in his understanding of time as revealed by his theory of relativity.
In Einstein's theory of special relativity, he proposed that space and time are intertwined into a four-dimensional fabric called spacetime. According to this theory, the laws of physics should be the same for all observers who are moving at a constant velocity relative to each other.
One consequence of special relativity is that the concept of simultaneity, or events happening at the same time, becomes relative. Observers in different reference frames may perceive events as simultaneous or occurring at different times.
Einstein expanded upon these ideas in his theory of general relativity, where he incorporated gravity into the fabric of spacetime. According to general relativity, massive objects like planets and stars deform the geometry of spacetime, causing it to curve. This curvature influences the motion of other objects in the vicinity.
In this framework, time becomes intertwined with the geometry of spacetime. The curvature caused by massive objects affects the passage of time itself. This phenomenon is known as gravitational time dilation.
The quote by Einstein suggests that the experience of past, present, and future can be subjective and dependent on one's frame of reference and the influence of gravity. It implies that the concept of time as an absolute and objective entity may be an illusion.
Einstein's statement challenges our intuitive understanding of time, suggesting that it may not be as straightforward as we perceive it in our everyday experiences. It highlights the deep connection between space, time, and the relativistic nature of reality as described by his theories.