„One who reveals your faults to you like a mirror is your true friend, and one who flatters you and covers up your faults is your enemy.“
— Husayn ibn Ali The grandson of Muhammad and the son of Ali ibn Abi Talib 626 - 680
Majlisi, Bihārul Anwār, vol.78, p. 128
— Benjamin Franklin, livro Almanaque do Pobre Ricardo
Poor Richard's Almanack (1756); this has also been quoted in a paraphrased form used by Bill Clinton in [ 1998 address to Beijing University http://news.bbc.co.uk/2/hi/asia-pacific/122320.stm, as "Our critics are our friends, they show us our faults".
Poor Richard's Almanack
— Bob Marley Jamaican singer, songwriter, musician 1945 - 1981
— Jack Vance, Lyonesse Trilogy
Fonte: Lyonesse Trilogy (1983-1989), The Green Pearl (1985), Chapter 8, section 3 (p. 480)
„Don't underestimate the power of your enemy, no matter how big or small, one day it could be to your detriment.“
— Attila King of the Hunnic Empire 406 - 453
— William Blake English Romantic poet and artist 1757 - 1827
„Always sleep with one eye open. Never take anything for granted. Your best friends might just be your enemies.“
— Sara Shepard, The Lying Game
Fonte: The Lying Game
— Richelle Mead, livro Last Sacrifice
Fonte: Last Sacrifice
„Go up close to your friend but do not go over to him! We should respect the enemy that is in our friend“
— Friedrich Nietzsche German philosopher, poet, composer, cultural critic, and classical philologist 1844 - 1900
— Mario Puzo American Novelist 1920 - 1999
— Sun Tzu ancient Chinese military general, strategist and philosopher from the Zhou Dynasty -543 - -495 a.C.
This has often been attributed to Sun Tzu and sometimes to Petrarch. It comes most directly from a line spoken by Michael Corleone in The Godfather Part II (1974), written by Mario Puzo and Francis Ford Coppola:
My father taught me many things here. He taught me in this room. He taught me: keep your friends close but your enemies closer.
Niccolò Machiavelli, who is also sometimes credited, wrote on the subject in The Prince:
It is easier for the prince to make friends of those men who were contented under the former government, and are therefore his enemies, than of those who, being discontented with it, were favourable to him and encouraged him to seize it.
— Niccolo Machiavelli Italian politician, Writer and Author 1469 - 1527
Machiavelli commented on the relative ease of gaining favor from friends and enemies in Chapter 20 of The Prince, quoted above. However, this particular wording comes from a line spoken by Michael Corleone in The Godfather Part II (1974), written by Mario Puzo and Francis Ford Coppola:
My father taught me many things here. He taught me in this room. He taught me: keep your friends close, but your enemies closer.
— Dale Carnegie, How to Win Friends and Influence People
How to Win Friends and Influence People
— Jean Cocteau French poet, novelist, dramatist, designer, boxing manager and filmmaker 1889 - 1963
Diary of an Unknown (1988)
— Mark Twain American author and humorist 1835 - 1910
— Paulo Coelho Brazilian lyricist and novelist 1947
Fonte: Economic Warfare Quotes
— James Carville political writer, consultant and United States Marine 1944
James Carville – 1992, As quoted by Hunter S. Thompson, Better Than Sex, p. 189
— Orson Scott Card, Hart's Hope
Fonte: Hart's Hope
— Pythagoras ancient Greek mathematician and philosopher -585 - -495 a.C.
As quoted in Geary's Guide to the World's Great Aphorists (2007) by James Geary, p. 118