If anyone conceives that he is loved by another, and believes that he has given no cause for such love, he will love that other in return.
 Baruch Spinoza, Ethics (1677). copy citation

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Author Baruch Spinoza
Source Ethics
Topic love cause
Date 1677
Language English
Reference
Note Translated by R. H. M. Elwes
Weblink http://www.gutenberg.org/files/3800/3800-h/3800-h.htm

Context

“he will, therefore, forthwith endeavour to repay it in kind. Q.E.D. Note.—The endeavour to injure one whom we hate is called Anger; the endeavour to repay in kind injury done to ourselves is called Revenge. PROP. XLI. If anyone conceives that he is loved by another, and believes that he has given no cause for such love, he will love that other in return. (Cf. III. xv. Coroll., and III. xvi.) Proof.—This proposition is proved in the same way as the preceding one. See also the note appended thereto. Note.—If he believes that he has given just cause for the love, he will take pride therein” source