“Home is anywhere that you know all your friends and all your enemies.”
Source: Hart's Hope
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Orson Scott Card 586
American science fiction novelist 1951Related quotes
Source: The Goblin Quest Series, Goblin Hero (2007), Chapter 7 (p. 117)
"Am I the NRA?" collected in Lever Action (2001) and republished online in 2007 http://www.ncc-1776.org/tle2007/tle401-20070114-03.html.
“If you want enemies, excel your friends; but if you want friends, let your friends excel you.”
How to Win Friends and Influence People

“Your Worst Enemy Could Be Your Best Friend && Your Best Friend Your Worst Enemy”

“Count me not your friend but the enemy of your enemies.”
Source: Lyonesse Trilogy (1983-1989), The Green Pearl (1985), Chapter 8, section 3 (p. 480)

“Your friend is the man who knows all about you, and still likes you.”
Variant: A friend is one who knows you and loves you just the same.
Source: The Note Book of Elbert Hubbard (1927), p. 112.

“To know your Enemy, you must become your Enemy.”
This is sometimes attributed to Sun Tzu in combination with the above quote, as well as alone, but it too has not been sourced to any published translation of The Art of War, though it is similar in concept to his famous statement in Ch. 3 : "It is said that if you know your enemies and know yourself, you will not be imperiled in a hundred battles..."
Misattributed