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There is no doubt that a person's charms are less frequently a cause of love than a remark such as: 'No, this evening I shan't be free'.

Marcel Proust (2000). “In Search of Lost Time, Volume IV: Sodom and Gomorrah (A Modern Library E-Book)”, p.245, Modern Library
There is no doubt that a person's charms are less frequently a cause of love than a remark such as: 'No, this evening I shan't be free'.