"None are so hopelessly enslaved as those who falsely believe they are free." - Goethe
It is a huge belief of mine that none of us are free. Its also something that I wish I didn't believe. Its like the snooker-ball example - if you position the cue at a certain angle and input a certain amount of power, the white ball will move a certain distance, in a certain direction, and depending on the circumstances will cause a certain effect, that can be predicted, given that you knew all the circumstances (the positions of the other balls, for example). It's possible to predict with 100% accuracy the outcome of the shot.
The same thing can be applied to life, just in a really really really complex way. Because of every single circumstance in the world, everything that is going to happen is mapped out and ready to happen, right down to the millisecond. And we can't change it or argue with it because thats down to circumstance, too. You might want to leave a comment with an opposing argument - but BAM, you don't have a choice in that because thats the kind of person you are because of a whole other load of circumstances. You weren't free to choose. We are not free. Some like to call it fate. We are all fishies in the tank, not free to be able to choose to get out or not. And if we do get out, thats not our choice either, because thats just the kind of fish we were destined to be.