Source: Eat, Pray, Love
Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 479.
“Never let your personal desires and emotions outcompete your reasoning capacity.”
Quoted from his first book https://en.wikipedia.org/wiki/Success_and_Failure_Based_on_Reason_and_Reality, "Success and Failure Based on Reason and Reality" https://www.amazon.co.uk/SUCCESS-FAILURE-BASED-REASON-REALITY/dp/9970983903/ on Amazon, P.51 (July 2018)
"The Funny Side of 'Beowulf'", The Miami Herald, November 2, 1997.
Columns and articles
“Love is the condition in which the happiness of another person is essential to your own.”
"Jubal Harshaw" in the first edition (1961); the later 1991 "Uncut" edition didn't have this line, because it was one Heinlein had added when he went through and trimmed the originally submitted manuscript on which the "Uncut" edition is based. Heinlein also later used a variant of this in The Cat Who Walks Through Walls where he has Xia quote Harshaw: "Dr. Harshaw says that 'the word "love" designates a subjective condition in which the welfare and happiness of another person are essential to one's own happiness.'"
Source: Stranger in a Strange Land (1961; 1991)
“If this person slept with your girlfriend, she would never be attractive to you again.”
Chuck Klosterman IV: A Decade of Curious People and Dangerous Ideas (2006), Recognizing Your Archenemy
