Gloria Naylor quote: “Power knows power.”

“That’s power, Mitch, absolute power. And you know the old saying. Power ennobles. Absolute power ennobles absolutely.”

Frederik Pohl book The Space Merchants

Source: The Space Merchants (1953), Chapter 4 (p. 44)

“When the power of love overcomes love of power the world will know peace.”

Jimi Hendrix (1942–1970) American musician, singer and songwriter

This quote has been attributed to Hendrix on the internet, and is flatly denied to have ever been said by him, without presenting any evidence as to why, beyond such unsupported, derisive and denigrative statements such as the author rants about others making in "WHAT HENDRIX NEVER SAID : They Don't Want to Know What He Really Said and Demand a Slacker Fantasy Instead" (22 March 2010) by Michael Fairchild, at rockprophecy.com http://www.rockprophecy.com/hendrix_quotes_hoax.html. Whether or not he ever spoke them, they are very similar to those reportedly of British Prime Minister William Ewart Gladstone, quoted in The Forbes Book of Business Quotations (1997) edited by Edward C. Goodman and Ted Goodman, p. 639: "We look forward to the time when the Power of Love will replace the Love of Power. Then will our world know the blessings of peace." A similar quotation he provides of Sri Chinmoy predates any currently located source of either the Hendrix or Gladstone attributions, yet he accuses Chinmoy of simple plagiarism of Gladstone (or "Gladwell" at one point). From Chinmoy's book My Heart Shall Give A Oneness-Feast (1993) he quotes: "My books, they all have only one message: the heart's Power Of Love must replace the mind's Love Of Power. If I have the Power Of Love, then I shall claim the whole World as my own … World Peace can be achieved when the Power Of Love replaces the Love Of Power." An even earlier statement of Chinmoy is found in Meditations: Food For The Soul (1970): "When the power of love replaces the love of power, man will have a new name: God."
Disputed
Variant: When the power of love overcomes the love of power, the world will know peace.

“Egoism is the identification of the power that knows with the instruments of knowing.”

Patañjali (-200–-150 BC) ancient Indian scholar(s) of grammar and linguistics, of yoga, of medical treatises

§ 2.6
Yoga Sutras of Patañjali

“Socialists cry "Power to the people", and raise the clenched fist as they say it. We all know what they really mean—power over people, power to the State.”

Margaret Thatcher (1925–2013) British stateswoman and politician

Speech to Conservative Central Council (15 March 1986) http://www.margaretthatcher.org/speeches/displaydocument.asp?docid=106348
Second term as Prime Minister
Context: Popular capitalism, which is the economic expression of liberty, is proving a much more attractive means for diffusing power in our society. Socialists cry "Power to the people", and raise the clenched fist as they say it. We all know what they really mean— power over people, power to the State. To us Conservatives, popular capitalism means what it says: power through ownership to the man and woman in the street, given confidently with an open hand.

“We look forward to the time when the Power of Love will replace the Love of Power. Then will our world know the blessings of peace.”

William Ewart Gladstone (1809–1898) British Liberal politician and prime minister of the United Kingdom

Attributed in The National elementary principal https://books.google.com/books?id=T8YVAQAAIAAJ&q=%22Then+will+our+world+know+the+blessings+of+peace.%22&dq=%22Then+will+our+world+know+the+blessings+of+peace.%22&hl=en&sa=X&ved=0ahUKEwj1iNCMvcHLAhUMcz4KHXvcCt84MhDoAQgfMAE (1948) - Volume 28 - Page 34; a similar statement has also become attributed to Jimi Hendrix: "When the power of love overcomes love of power the world will know peace." A similar quotation is found in My Heart Shall Give A Oneness-Feast (1993) by Sri Chinmoy: "My books, they all have only one message: the heart's Power Of Love must replace the mind's Love Of Power. If I have the Power Of Love, then I shall claim the whole World as my own … World Peace can be achieved when the Power Of Love replaces the Love Of Power." An even earlier statement of Chinmoy is found in Meditations: Food For The Soul (1970): "When the power of love replaces the love of power, man will have a new name: God."
Disputed
Variant: We look forward to the time when the Power of Love will replace the Love of Power. Then will our world know the blessings of peace.