“Time began with the world – or after it.” Judaeus said that sometime in the first century (Philo Judaeus. 20 B.C.– 40 A.D.). What does that mean?
Well, according to Albert Einstein and his Theory of Relativity, it means that “If matter and its motion disappeared there would no longer be any space or time.” So prior to the existence of matter - the physical universe - there was no time.
I always think of it as holding a pencil between my thumb and forefinger and thinking of that pencil as “time.” It has a beginning and it has an end. The space around the pencil is eternity. People think in terms of concepts like “eternity” as being an extension of that pencil far into the future. The pencil goes on and on endlessly. This is the notion that time extends for ever, but that isn’t the case. In a timeless world there is no future. There is only "now."
Time has a beginning and it may very well have an end. So our existence, our universe and time itself is like the pencil floating in a vast sea timelessness.
Time could actually be an aberration. It may only exist in the physical universe. It may only be a factor in our existence. If there is a God, he must exist outside of space and time. Outside of our reality and our limitations. You wouldn’t find Mozart in one of his symphonies, for example, or God within his creation. But that’s another subject. The point is that a Creator would exist outside our time/space continuum.
Remember…you can’t have space or time without matter and motion. “Eternity” is not an extension of time. It is the absence of time.
It’s an interesting concept and one that has always fascinated me. It’s cud for rumination.