According to the apostle and the simple sense of him who is in Christ Jesus, it is not merely the lack of a quality in the will or indeed merely the lack of light in the intellect, of strength in the memory. Rather it is a complete deprivation of all rectitude and of the ability of all the power of the body as well as the soul and of the entire inner and outer man. In addition to this, it is an inclination to evil, a disgust at the good. a disinclination toward light and wisdom; it is love of error and darkness, a fleeing from good works and a loathing of them, a running to what is evil.
– Martin Luther
as quoted by Sproul, R.C.; Grace Unknown: The Heart of Reformed Theology; Baker Books; Grand Rapids, MI; copyright 1997; p. 124