“If I learned anything Downtown, it's this: the only real difference between an enemy and a friend is the day of the week.”
Source: Sandman Slim
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Richard Kadrey 23
San Francisco-based novelist, freelance writer, and photogr… 1957Related quotes
Source: The Goblin Quest Series, Goblin Hero (2007), Chapter 7 (p. 117)

though their reasons are absurd!
"Definition"
Shades of the World (1985)

“In life we never lose friends. We only learn what are the real we have.”
Original: (it) Nella vita non perdiamo mai amici. Apprendiamo solo quali sono i veri che abbiamo.
Source: prevale.net

Opinion: The Syrian Orphan and a Club of Cynics http://english.aawsat.com/2015/09/article55345155/opinion-the-syrian-orphan-and-a-club-of-cynics, Ashraq Al-Awsat (18 Sep, 2015).
“Anything that deprives a man of real life is an enemy to that man.”
Source: Something More, A Consideration of the Vast, Undeveloped Resources of Life (1920), p. 83-84
Context: Anything that deprives a man of real life is an enemy to that man. If real life is relationship, the dwelling on friendly and affectionate terms with God and man, then anything that separates us from God, from our better selves, and from our fellows, is an enemy. Another name for this enemy is sin. It is sin that wrecks the characters of men and deprives them of their spiritual heritage. Sin is the most subtle, treacherous, and deadly of all foes. It is the destroyer of real life.

“I'm a million different things every day of the week.”
Source: P.S. I Love You
《乌克兰宪政危机与政治决断》 ["Ukraine's constitutional crisis and political decisions"] (2004), translated by David Ownby in Rethinking China's Rise, p. 27