On occasion I have heard zen writings claiming that the best mind is the " I don't know" mind. Although I find it very similar to the beginner mind ( although this is unrelated to my question).

My question is whether this " I don't know " mind really means just that.

By having this "I don't know" mind, are we saying we truly do not know? Or are we saying we know, but do not wish to delve into it?

Thanks for your input.