Well, I think conscious reasoning uses a lot of unconscious understanding in the process as well. It is all intertwined, as I have described in previous posts. But if you like, then let us go with that definition, no problem. Then, we understand the difference between right and wrong intuitively. But so do we understand the difference between red and green traffic lights. And the difference between sickness and health. And we reckon intuitively that the things that we remember doing, happened. For example, you do not need any conscious reasoning to tell that you posted before in this thread. You know it intuitively - you remember doing so, and you trust your memories. And intuitively I trust my eyes and know that there is a monitor in front of me. You do the same. And so on.
Actually, our intuitions too, even in the narrow sense (see examples above). How else do you know about green and red?
It is the other way around. Science is good but dispensable. Humans did without it for nearly all of the time they've been around. On the other hand, intuitions are indispensable except for very few, and so are the rest of our faculties if you want to separate them, except again for very few.
Introspection, and intuition generally, are necessary. If you want do distinguish them from other faculties, then other faculties are also necessary. Intuitions and other faculties fail sometimes, but in the vast majority of cases, they do not fail. That is how we can do science, logic, and other stuff.
I'm saying you also believe that normally, even if you do not put it in words. I am saying that all humans do that. Why do I believe that there is a monitor in front of me? Intuitively, of course. I can rationalize it and think about it, but not without using many other intuitions I need to rely on. How do I know that the headphones in my desk are red? Well, intuitively of course. I just look at them. How do I even know there are headphones on my desk? Intuitively of course. You get the picture, hopefully.
ruby sparks said:
Our intuitions about ourselves, how our brains function and our psychology, are, in some keys ways, very unreliable indeed, particularly in relation to how 'brain/mind stuff' actually works, things like sense of self, consciousness, and agency, and the various relevant sciences are undermining our intuitions about them, possibly more than you are allowing for.
But you rely on them all the time. When writing your posts, you rely on your memories. You tell Wiploc "You're not the only person in this thread feeling that about Angra's posts, on either free will or morality.", and in doing so, you just trusted a gazillion of memories about what happened in our exchange - all of that, of course, intuitively. For each intuition about ourselves that is found wanting, there is an ocean that work fine - and that you use all the time, as you are human. Why then target moral ones for distrust, in particular?