Passion is an element in life bound to have a logic not less pitiless than yours.
 Honoré de Balzac, Letters of Two Brides (1841). copy citation

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Author Honoré de Balzac
Source Letters of Two Brides
Topic logic passion
Date 1841
Language English
Reference
Note Translated by R. S. Scott
Weblink http://www.gutenberg.org/files/1941/1941-h/1941-h.htm

Context

“I have taken comfort in the thought that, while I was lamenting, love was doubtless busy knocking down the scaffolding of reason. It may be that I shall do worse than you without any reasoning or calculations. Passion is an element in life bound to have a logic not less pitiless than yours. Monday. Yesterday night I placed myself at the window as I was going to bed, to look at the sky, which was wonderfully clear. The stars were like silver nails, holding up a veil of blue. In the silence of the night I could hear some one breathing, and by the half-light of the stars I saw my Spaniard, perched like a squirrel on the branches of one of the trees lining the boulevard, and doubtless lost in admiration of my windows.” source