SEVEN KNOWLEDGES, FOUR IGNORANCES

We have heard of a Society for the Diffusion of Useful Knowledge. It is said that knowledge is power; and the like. Methinks there is equal need of a Society for the Diffusion of the Useful Ingnorance, what we will call Beautiful Knowledge, a knowledge useful in a higher sense: for what is most of our boasted so called knowledge but a conceit that we know something, which robs us of the advantage of our actual ignorance? What we call knowledge is often our positive ignorance, ignorance our negative knowledge.
(Henry David Thoreau | Walking)