Ignorance cannot always be inferred from inaccuracy; knowledge is not always present.
Samuel Johnson, Hester Lynch Piozzi, James Boswell (1804). “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 works of Mrs. Piozzi;--his Life, recently published by Mr. Boswell, and other authentic testimonies; also his will, and the sermon he wrote for the late Doctor Dodd”, p.238