“There isso mortifying as to fall in love with someone who does not share one's sentiments.”

Variant: It's one thing to fall in love. It's another to feel someone else fall in love with you, and to feel a responsibility toward that love.
Source: Every Day

Original: (it) L'eccessiva gelosia è l'alibi di chi non dà abbastanza valore a colui che chiama amore.
Source: prevale.net

Source: Something Borrowed

Book I; ix, 46
Amores (Love Affairs)

Un genio es alguien que descubre que la piedra que cae y la luna que no cae representan un solo y mismo fenómeno.
Ernesto Sábato, in On Heroes and Tombs [Sobre héroes y tumbas] (1961), Ch. X
Variant translation: A genius is someone who discovers that the falling stone and the moon that falls represent one and the same phenomenon.

Source: We Need to Talk About Kevin

The Book of Illusions (2002)

Source: My Name is Red