Well, it sounds right. But which mistake in rationality was done in that described situation, and how can it be improved? My first idea was that there are things we shouldn't doubt... But it is kind of dogmatic and feels wrong. So should it maybe be like "Before doubting X think of what will you become if you succeed, and take it into consideration before actually trying to doubt X". But this still implies "There are cases when you shouldn't doubt", which is still suspicious and doesn't sound "rational". I mean, doesn't sound like making the map reflect the territory.