Because that's how it feels when you're depressed.

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Notes from Wikiquote

as quoted in Love at Goon Park: Harry Harlow and the Science of Affection, by Deborah Blum, Perseus Publishing, 2002

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Attribution

Quote text and notes from Wikiquote: Harry Harlow (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.