The Polish saying "nadzieja jest matką głupich" translates to "hope is the mother of fools" in English. This proverb implies that overly optimistic or hopeful individuals are foolish or naive. It suggests that relying solely on hope without taking practical actions or acknowledging the reality of a situation is unwise. This saying warns against the dangers of being excessively optimistic or having blind faith in positive outcomes without considering potential negative consequences or realities.