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A close long-term relationship with a person or situation brings about feelings of boredom or lack of respect.

The saying is recorded in English from the late 14th century, but the idea is found in the 5th century ad in the Latin of St Augustine, ‘vulgare proverbium est, quod nimia familiaritas parid contemptum [it is a common proverb, that too much familiarity breeds contempt].