“To care passionately for another human creature brings always more sorrow than joy; but at the same time, Elinor, one would not be without experience. Anyone who has never really loved has never really lived..”
Source: Sad Cypress
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Agatha Christie 320
English mystery and detective writer 1890–1976Related quotes

“It is not everyone,' said Elinor, 'who has your passion for dead leaves.”
Source: Sense and Sensibility
The Pleasures of Love (1961).
Context: The pleasures of love are for those who are hopelessly addicted to another living creature. The reasons for such addiction are so many that I suspect they are never the same in any two cases. It includes passion but does not survive by passion; it has its whiffs of the agreeable vertigo of young love, but it is stable more often than dizzy; it is a growing, changing thing, and it is tactful enough to give the addicted parties occasional rests from strong and exhausting feeling of any kind.

“You never really hate anyone as much as someone you cared about once.”
Variant: Unfortunately, you never really hate anyone as much as someone you cared about once.
Source: City of Glass

“He that never had sorrow of love never had joy of it either!”
Swem nie von liebe leit geschach,
dem geschach ouch liep von liebe nie.
Source: Tristan, Line 204