I just had déjà vu. How does it start? When and where did I experience that exact moment the first time, totally out of context? I don't know if I was sleeping, or zoned out, or if it wormed its way into my memory. I had a memory of something that hadn't happened. As it passed, like the first time I thought it happened, I wanted to stop, to break it, but I had to finish my thought. If my thought was to break it, I would have experienced that thought and changed my actions before, and thought I had succeeded both times, until I realized this.
Thus begins a hypothetical rant, best read by the open minded.
To simplify it massively, your mind is the result of your brain, influenced by the chemicals and energy in your body, which is influenced by the universe of physics, as it has happened.
I was destined to complete the action exactly that way. With everything in the universe as it was at that moment, with the thoughts and plans, actions and reactions of myself and everyone else in the form of our brains' electrical signals en route, and every object, cell, atom and bit of energy imaginable in the place they were at that time, there was simply no other way it could have happened.
There is only one way I will finally choose to post this, and when you read it, based on the state of everything at the moment you read it, there is only one way you can respond. You appear to have unlimited choices, but there is only one set of choices you will ultimately make, and it will only appear to you that you follow it of your own accord. You may wrongly take this to mean I think one should do anything they please. You may think I'm only rambling and ignore it. You may even get angry at me for trying to say it. Regardless, you were always going to respond that way, and remain deeply under the impression that you chose to do so in that way.
Every detail of everything that will ever happen is already underway. The future is precisely destined, and yet completely unknowable, for we could never hope to simulate it.
Environment is everything. Choice is an immensely complicated delusion.
...but, for our purposes, it's probably better to maintain it.