Not knowing comes in two distinct flavors…
There is the not knowing outside of thought and stories, and the not knowing inside of thought and stories.
Awareness is inherently free from knowing, and this is noticed when this field of awakeness and form awakens to itself as a field, inherently free from the filter of any story, including the stories of a separate self, a center, a subject and object, and so on. This is the not knowing outside of thoughts and stories, the not knowing inherent in the Buddha Mind. And we can notice this one in a simple way by asking ourselves: is knowing inherent in the awareness of what is happening here now, or does a sense of knowing come from the filter of thought overlaid on this?
Then there is the conventional not knowing, the not knowing within the context of stories. The world is always more than and different from our stories about it (our maps, theories, assumptions, guesses, beliefs), so our stories are of temporary and practical value only. They help us orient and navigate in the world, but not much more than that. Inherent in any story is the not knowing from it having only limited and practical value, at best, and from the equally limited truth in each of its reversals.
Noticing and becoming familiar with both of these forms of not knowing is of great value in our lives. The first not knowing help us notice what we really are, free from and outside of any stories. The second not knowing helps us see stories as only tools of practical and temporary value. Both help us find ourselves as that which is already free from stories, see thoughts as just thoughts, and free us from taking stories as anything more than just stories. There is a mutuality between both, one offering insight into the other.
And they are really just two ways of talking about the same.