Oh sirs, deal with sin as sin, and speak of heaven and hell as they are, and not as if you were in jest.
— John Flavel
Take heed of secret sins. They will undo thee if loved and maintained: one moth may spoil the garment; one leak drown the ship; a penknife stab and kill a man as well as a sword; so one sin may damn the soul; nay, there is more danger of a secret sin causing the miscarrying of the soul than open profaneness, because not so obvious to the reproofs of the world; therefore take heed that secret sinnings eat not out good beginnings.
— Jeremiah Burroughs