Full Idea
Even if we decide that an idea really is inspired, we cannot be sure, or nearly sure, that the statement is true. We know one of the commandments of the Bible was printed without a 'not' in it.
Gist of Idea
If we decide an idea is inspired, we still can't be sure we have got the idea right
Source
Charles Sanders Peirce (Scientific Attitude and Fallibilism [1899], II)
Book Reference
Peirce,Charles Sanders: 'Philosophical Writings of Peirce', ed/tr. Buchler,Justus [Dover 1940], p.57