Lastly, "Meditation IV" attributes the source of error to a discrepancy between two divine gifts: understanding and free will. Understanding is given in an incomplete form, while will (by nature) can only be either completely given or not given at all. When he is presented with a certain amount of understanding and then "chooses" to act outside of that, he is in error. Thus, the gifts of God (understanding and will) both remain good and only the incorrect usage by him remains as error.