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There’s none so blind as those who will not see.
When the blind lead the blind, both shall fall into the ditch.
In the country of the blind, the one-eyed man is king.
There’s none so deaf as those that will not hear.
A fool and his money are soon parted.
Ignorance is bliss.
Where ignorance is bliss, ‘tis folly to be wise.
Penny wise, pound foolish.