Predestined free will?

Christians have been debating for centuries whether predestination or free will decides our destiny. If we believe in predestination only, then why do anything in life? Everything is pre-determined, we might as well just sit back and watch everything unfold before our eyes. On the other hand, if our free will solely determines our life's outcome then that's pretty scary because my track record of choosing right hasn't been stellar--and your's probably hasn't been much better. To wholly believe in predestination pushes us to become extremely passive; to wholly believe in free-will leads us to become control freaks. 

The Bible seems to advocate that the two concepts are not mutually exclusive--that they both have a place.  Perhaps that's why Christians have debated this so much! Life experience confirms both realities. To begin with, our genetic disposition is given to us and we are born into families, countries, and at a time in history that we did not choose. And, in life, we make choices to the best of our knowledge and ability, sometimes we enjoy the fruit of good decisions and other times we find ourselves attributing unfortunate outcomes to 'bad luck' or 'bad timing'. But we know that our decisions and action matter. The fact that our thoughts and actions impact others and ourselves is obvious.  

Exactly how these two concepts hold together may be one of those mysteries that God cannot reveal to us for now.  Our time-bound, linear minds cannot hold the two truths together.