Ali (601–661) cousin and son-in-law of the Islamic prophet Muhammad
As quoted in "Considerations By the Way" in Conduct of Life by Ralph Waldo Emerson
Variant translation: Believe me, a thousand friends suffice thee not; In a single enemy thou hast more than enough
Pythagoras (-585–-495 BC) ancient Greek mathematician and philosopher
As quoted in Diogenes Laërtius, Lives and Opinions of Eminent Philosophers, "Pythagoras", Sect. 23, as translated in Dictionary of Quotations http://archive.org/details/dictionaryquota02harbgoog (1906) by Thomas Benfield Harbottle, p. 320
Husayn ibn Ali (626–680) The grandson of Muhammad and the son of Ali ibn Abi Talib
Majlisi, Bihārul Anwār, vol.78, p. 128
General Quotes
“Don't be afraid of enemies who attack you. Be afraid of the friends who flatter you.”
Dale Carnegie How to Win Friends and Influence People
Source: How to Win Friends and Influence People
“He will never have true friends who is afraid of making enemies.”
William Hazlitt (1778–1830) English writer
No. 401
Characteristics, in the manner of Rochefoucauld's Maxims (1823)
Source: Selected Essays, 1778-1830
Warren G. Harding (1865–1923) American politician, 29th president of the United States (in office from 1921 to 1923)
Remark to editor William Alan White, as quoted in Thomas Harry Williams et al. (1959) A History of the United States.
1920s
“If the enemy of my enemy is my friend, then surely you should be friend to my friend.”
Holly Black book The Coldest Girl in Coldtown
Source: The Coldest Girl in Coldtown
