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At best, the natural good-nature is edged with complaint or has changed into sullenness and gloom. And now and then it blazes forth in veiled but hot anger.

W. E. B. Du Bois (2012). “The Souls of Black Folk”, p.79, Courier Corporation
At best, the natural good-nature is edged with complaint or has changed into sullenness and gloom. And now and then it blazes forth in veiled but hot anger.