If indeed there is such a thing as free will then by definition it must be supernatural. If, on the other hand, all of our actions are determined by a intricately complex set of natural causes and effects then our power of decision is merely an illusion. How can we tell if free will exists? Simple: We all make mistakes. Programmed automatons can’t, you know, no matter how sophisticated. So-called “computer-error” is actually user error, programmer error, manufacturer error or environmental causes outside the computer’s control. How do I know I am right about all this? Because I can’t be in error without proving myself correct. If I am a programmed automaton and it is not my error, then whose is it? Free will is necessary to make a mistake.
God's word tells us that righteousness is a gift; it cannot be earned. But godliness is not a gift. We must pay a price to touch godliness through a daily decision to die to self and embrace the cross. God calls us to learn godliness in the classroom of life among people as we sit on airplanes and buses, walk among our neighbors and labor at our factories or desks.