Source: Love and Friendship (1993), p. 15.
“The close affinity between sexual Eros and deceit is very startling - as in infatuation, infidelity and jealousy: " Quoniam lumbi mei repleti sunt illusionibus. " For, isolated, Eros is in every sense the most treacherous counterfeit of love, sending a continual flow of self-deception and delusion throughout the world, etc.”
Broken Lights p. 33 Diaries 1951.
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Ida Friederike Görres 57
Austrian writer and noble 1901–1971Related quotes

"Science and Scientism", p. 115.
The Second Sin (1973)
"Love and Its Loveless Counterfeits"
Strictly Personal (1953)
Context: The principal difference between love and hate is that love is an irradiation, and hate is a concentration. Love makes everything lovely; hate concentrates itself on the object of its hatred. All the fearful counterfeits of love — possessiveness, lust, vanity, jealousy — are closer to hate: they concentrate on the object, guard it, suck it dry.

Source: "Woman in Europe" (1927), P.254

“In jealousy there is more of self-love than love.”
Il y a dans la jalousie plus d'amour-propre que d'amour.
Maxim 324.
Reflections; or Sentences and Moral Maxims (1665–1678)

“The brain is very good at self-delusion.”
Talks at Google (Oct 28, 2014)

Third Olynthiac http://books.google.com/books?id=n4INAAAAYAAJ&q="the+easiest+thing+in+the+world+is+self-deceit+for+every+man+believes+what+he+wishes+though+the+reality+is+often+different"&pg=PA57#v=onepage, section 19 (349 BC), as translated by Charles Rann Kennedy (1852)
Variants:
A man is his own easiest dupe, for what he wishes to be true he generally believes to be true.
As quoted in The Routledge Dictionary of Quotations (1987) by Robert Andrews, p. 255
There is nothing easier than self-delusion. Since what man desires, is the first thing he believes.