What Descartes doubted was that he (or anyone) could know for certain that what we believed,
based on sense-experience, was true. So, someone who accepted Descartes notion of doubt, who
tried to pass down "family heritage and history," could easily say to others: "Look, I believe what I am
telling you is true, and I think I have good reasons for thinking it is true, but I am not absolutely certain
what I am telling you is true." With that as a preface, he could happily relate the history and the
heritage. When Descartes doubted things, he did not doubt that they were true. What he doubted was
that he could be absolutely certain of them.