Full Idea
It seems to me there is the most historic proof that innate truths are particularly uncertain and mixed up with error, and therefore a fortiori not without exception.
Clarification
'A fortiori' means 'even more obviously'
Gist of Idea
Innate truths are very uncertain and full of error, so they certainly have exceptions
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