Knowledge has two extremes. The first is the pure natural ignorance in which all men find themselves at birth. The other extreme is that reached by great minds, who, having run through all that men can know, find they know nothing, and come back again to that same natural ignorance from which they set out; this is a learned ignorance which is conscious of itself.
We run carelessly to the precipice, after we have put something before us to prevent us seeing it.
We run heedlessly into the abyss after putting something in front of us to stop us from seeing it.
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