Rash oaths, whether kept or broken, frequently produce guilt.
Samuel Johnson, Hester Lynch Piozzi, James Boswell (1787). “The Beauties of Samuel Johnson, LL.D.: Consisting of Maxims and Observations, Moral, Critical, and Miscellaneous, to which are Now Added, Biographical Anecdotes of the Doctor, Selected from the Late Productions of Mrs. Piozzi, Mr. Boswell, ...”, p.189