Are all of our thoughts and actions predetermined?

That's a Calvinistic line of thought, which I do not personally believe. This "David" I take it, was to be like "God", omniscient and all powerful. Well it is entirely possible that a being such as this could know all of my actions before I do them, I can't prove that there isn't. Although I believe that I guide my own actions, not some being, fate, or even another person.