“No one has ever become poor by giving.”
Attributed to Anne Frank in various self-help books but always without citation.
Disputed
Source: diary of Anne Frank: the play
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Anne Frank 110
victim of the Holocaust and author of a diary 1929–1945Related quotes

Examples of self-translation (c. 2004), Quotes - Zitate - Citations - Citazioni
“Clothes make the poor invisible…. America has the best-dressed poverty the world has ever known.”
Source: The Other America (1962), Ch. 1, sct. 1

“In mourning it is the world which has become poor and empty; in melancholia it is the ego itself.”
Source: On Freud's "Mourning and Melancholia"

“Anyone who has ever struggled with poverty knows how extremely expensive it is to be poor.”
"Fifth Avenue, Uptown: a Letter from Harlem" in Esquire (July 1960); republished in Nobody Knows My Name: More Notes of a Native Son (1961)
Source: Speaking the Truth: Ecumenism, Liberation, and Black Theology (1986), p. 9