[foo42]

People already know a lot of things.

But which "know"?

There's seeing something and recognising it as something you've seen before.

There's being able to recite it without seeing it.

There's being able to explain it.

There's _knowing_ it. Where your life is an active demonstration of having made it _part_ of you.

To the extent we obtain wisdom with life, it's usually a progression of things progressing deeper down the layers, years, perhaps decades after they attained level 1.

[foxglacier]

I'd insert another important level of knowing which I feel deserves the name "understanding" and that's knowing its relationships to other thing you also know. Perhaps even that's almost all there is in knowing something. The more relationships to it that you know, the deeper your understanding of it.