In which work does van Gogh say that he is trying to "express the terrible passions of humanity by means of red and green"?

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Vincent van Gogh expressed his intention to use the colors red and green to depict the "terrible passions of humanity" in reference to his painting "Night Café." He aimed to convey the atmosphere of a place where one could ruin oneself, go mad, or commit a crime, using these colors to evoke intense emotions and a sense of unrest.

In Which Work Does Van Gogh Say That He Is