>>17 thats a tough one you can interpret it in many ways(here is some food for thought):
1. maybe there is a higher being that gives us an essence or controls our actions, at the same time a higher being could also have given us free will so our actions have actual meaning to them.
2.(satre)you might say that we are doomed to be free, not only can we choose to do anything we want, but we also have to take the full responsibility for our every action. Our free will is the result that there is noone that made us we have no essence, which some might interpret as our lives being meaningless, but we are also free to choose the meaning of our lives and to chase our goals with everything that we are capable of doing
3. if we could know the position and movement of every atom we could predict the future. That means that all action are predestined on a timeline, also ours since(when you break it down to it) we are nothing more than a bunch of atoms.