WCF 9.3.
Man, by his fall into a state of sin, hath wholly lost all ability of will to any spiritual good accompanying salvation: (Rom. 5:6, Rom. 8:7, John 15:5) so as, a natural man, being altogether averse from that good, (Rom. 3:10, 12) and dead in sin, (Eph. 2:1, 5, Col. 2:13) is not able, by his own strength, to convert himself, or to prepare himself thereunto. (John 6:44, 65, Eph. 2:2–5, 1 Cor. 2:14, Tit. 3:3–5)