“There are two kinds of forecasters: those who don’t know, and those who don’t know they don’t know.”
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John Kenneth Galbraith 207
American economist and diplomat 1908–2006Related quotes

Muhammad Kulayni, Usūl al-Kāfī, vol.1, p. 55
Regarding Knowledge & Wisdom, General
Source: Relatives (1973)., Chapter 13 (p. 199).
Voyage of Discovery https://edifyedmonton.com/people/profiles/voyage-of-discovery/ (February 11, 2010)

Vanity Fair (February 1920)
Variant: There may be said to be two classes of people in the world; those who constantly divide the people of the world into two classes, and those who do not.
Context: There may be said to be two classes of people in the world; those who constantly divide the people of the world into two classes, and those who do not. Both classes are extremely unpleasant to meet socially, leaving practically no one in the world whom one cares very much to know.

Anthony Hopkins on the secret of his spooky success: ‘I like to act like a submarine’ https://herocomplex.latimes.com/uncategorized/anthony-hopkins-on-the-secret-of-his-spooky-success-i-like-to-act-like-a-submarine/ (February 11, 2010)