This is the way it works.

Imagine a train. Now, imagine riding that train. You know what your final destination is, but you really can't see that far ahead. No, all you can see is each track at a time, maybe a few tracks in the distance, but that's about it.

Now imagine if you could look at a map of that train's journey, you'd be able to see all the parts of it at once. If you had a map, you could run your eyes from the very beginning to the very end, or vice versa, if you so desired. It's not that time does not move, but that it is unimportant.

Now, imagine being able to travel freely between periods of your life. That is, in essence, the ability of seeing in the fourth dimension. When you realize that time is secondary, you realize that no one ever truly dies, for they are eternally trapped in their memories.