"How is it that there are the two times, past and future,
when even the past is now no longer and the future is now not yet?"
Augustinus, Confessions, Book 11, chap. 14
Meanwhile, we know that in addition to events which happened in our past and events which will happen in our future, there are also events which are space-like (neither in the past nor in the future); And we know that the present is really a single point in space-time.
Of course, there is nothing mysterious about relativity, the math is easy enough that nowadays they teach it in high school, Minkowski diagrams and the Lorentz group as homework exercise.
But still - I wonder about the present and how the activities of my brain fit into a single space-time point when I experience the "here and now" ...
Perhaps I should think more about world lines.