Perseverance of the saints

their certain continuance in a state of grace. Once justified
and regenerated, the believer can neither totally nor finally
fall away from grace, but will certainly persevere therein and
attain everlasting life.

This doctrine is clearly taught in these passages, John 10:28,
29; Rom. 11:29; Phil. 1:6; 1 Pet. 1:5. It, moreover, follows
from a consideration of (1) the immutability of the divine
decrees (Jer. 31:3; Matt. 24:22-24; Acts 13:48; Rom. 8:30); (2)
the provisions of the covenant of grace (Jer. 32:40; John 10:29;
17:2-6); (3) the atonement and intercession of Christ (Isa.
53:6, 11; Matt. 20:28; 1 Pet. 2:24; John 11:42; 17:11, 15, 20;
Rom. 8:34); and (4) the indwelling of the Holy Ghost (John
14:16; 2 Cor. 1:21, 22; 5:5; Eph. 1:14; 1 John 3:9).

This doctrine is not inconsistent with the truth that the
believer may nevertheless fall into grievous sin, and continue
therein for some time. (See BACKSLIDE T0000414.)