It takes some time of thinking and getting at it from various angles that suddenly there is an illumination. What was known tacitly gets expressed in a rational 'human' vocabulary of rules and principles. And strange, as soon as it gets thus expressed, it all fits in well. Occasionally, I not only find why I was opposed to the idea, but also find a snag to the reasoning.That leads to a corrective.
Interestingly, my understanding is that a lot of these evaluation of things based on the principles I rationally believe in, are pushed into lower levels of the brain (like trained circuits), which I am not conscious about. Even before the conscious part of the brain takes charge to evaluate the idea, the trained non-conscious part passes on its judgment. Of course the judgment can be incorrect, hopelessly in small number of cases, but it is a quick effortless judgment which gives guidance to the conscious part to re-evalutate. On the other hand, if you find a snag, there is a signal to re-train the circuits... I find it very useful, even though irritating.
Vivekananda called this 'nervous association of ideas'! I guess there are other terms/expressions for it.
Have you experienced it?