. . . . yet if there be a neglect in growing in holiness, the soul will never be soundly quiet, because it will be prone to question the truth of justification, and it is as proper for sin to raise doubts and fears in the conscience, as for rotten flesh and wood to breed worms.
Sibbes, Richard (2012-04-24). The Soul's Conflict With Itself: And Victory Over Itself By Faith. (p. 52). A Puritan At Heart Press. Kindle Edition.