To explain what I think it means let me use an analogy.
An old disgruntled gentleman sits near a fireplace and a bowl of fruit making fruit flies. As he makes them he puts a small dab of blue paint on some and green paint on others.
Then he takes the ones with blue paint, pulls the wings off them and tosses them into the fire. He places the ones with green paint on the fruit bowl.
The ones with green paint represent those that the fruit fly creator predestined for salvation and those with blue paint represent those that he predestined for destruction. The fruit flies have no say in their fate as it was determined when created.
Hope that this explains why I can't reconcile predestination with choice.
