The problem is, we couldn't affect change on anything that's already happened because it's already happened. That's the rub. Whatever we did would likely lead to the outcome and choices already-made.
Sometimes time would just make matter materialize however - without input or cause. For instance, if I found plans for a time machine in my grandmother's attic, then I built the time machine with the plans - and brought them to my Grandmother for safe keeping 100 years ago...and she put them in her attic...for me to find...to give to her....
And think about this - depending on one's perspective of time, RIGHT NOW my Grandmother is 15 years old. Her Right now is MY right now 90-some years later...100 years I think, by now. It's kinda neat.
It's the time paradoxes and affects that probably drive my theology as well as helps me understand my place in creation.
“… the greatest detractor from high performance is fear: fear that you are not prepared, fear that you are in over your head, fear that you are not worthy, and ultimately, fear of failure. If you can eliminate that fear—not through arrogance or just wishing difficulties away, but through hard work and preparation—you will put yourself in an incredibly powerful position to take on the challenges you face" - Pete Carroll.