Of Repentance Unto Life and Salvation(1689 LBCF, Chap. 15, Par. 2)

Whereas there is none that doth good and sinneth not, and the best of men may, through the power and deceitfulness of their corruption dwelling in them, with the prevalence of temptation, fall into great sins and provocations; God hath, in the covenant of grace, mercifully provided that believers so sinning and falling be renewed through repentance unto salvation.