Piet Hein, poet and scientist

Knowing what
Thou knowest not
Is in a sense
Omniscience.
Piet Hein, poet and scientist (1905-1996)

Interesting! It is true that the realm of things that we know we are ignorant about is very large, but in truth the full scope of knowledge Hein means includes not only what we know we don't know, but also what we don't even know is knowable. There are logically four realms of knowledge: what we know we know, what we think we know but don't really, what we know we don't know, and what we don't know we don't know. A look at the history of science gives us a hint of how large that last category may be.

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