Reformed theologians teach that sin so affects human nature that they are unable even to exercise faith in Christ by their own will. While people are said to retain free will in that they willfully sin, they are unable to not sin because of the corruption of their nature due to original sin. To remedy this, Reformed Christians believe that God chose or predestined some people to save. This choice is believed to be unconditional and not based on any characteristic or action on the part of the person chosen.