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There is the same difference in a person before and after he is in love, as there is in an unlighted lamp and one that is burning.

Vincent van Gogh, Vincent Willem Gogh (1927). “The Letters of Vincent Van Gogh to His Brother, 1872-1886: With a Memoir by His Sister-in-law, J. Van Gogh-Bonger ...”
There is the same difference in a person before and after he is in love, as there is in an unlighted lamp and one that is burning.