“Man treats woman as his own property and not as being capable of feelings, like himself. The way man treats women is much worse than the way landlords treat servants and the high-caste treat the low-caste. These treat them so demeaningly only in situations mutually affecting them; but men treat cruelly and as slaves, from their birth till death.”

Source: How to Take the Ex Out of Ex-Boyfriend

As quoted in Human Development : A Science of Growth (1961) by Justin Pikunas, p. 311; this might be based on a translation or paraphrase by Viktor Frankl, to whom it is also sometimes attributed.
:In Wilhelm Meister’s Lehrjahre (Book VIII, Chapter four) Goethe writes:
:“Wenn wir” sagtest Du, “die Menschen nur nehmen, wie sie sind, so machen wir sie schlechter; wenn wir sie behandeln als wären sie, was sie sein sollten, so bringen wir sie dahin, wohin sie zu bringen sind."
:Werke, Hamburger Ausgabe in 14 Bänden, Verlag C. H. Beck München, Herausgegeben von Erich Trunz
: Variant translations:
:*Treat people as if they were what they ought to be and you help them to become what they are capable of being.
::* As quoted in My Country Vol. 2, No. 3 (September 1968) by Litchfield Historical Society, p. 23
:* "‘When we take people,’ thou wouldst say, ‘merely as they are, we make them worse; when we treat them as if they were what they should be, we improve them as far as they can be improved.’"
::* This translation occurs in the Harvard Classics edition of Wilhem Meister's Apprenticeship, Book VIII, Chapter IV. Translation by Thomas Carlyle Bartelby Online Edition of 'Wilhelm Meister's Apprenticeship'. http://www.bartleby.com/314/804.html
Disputed

Il n'est pas si dangereux de faire du mal à la plupart des hommes que de leur faire trop de bien.
Maxim 238.
Reflections; or Sentences and Moral Maxims (1665–1678)

Vol. I, p. 268
William Lloyd Garrison 1805-1879 (1885)

Attributed to Carlyle in Dale Carnegie's How to Win Friends And Influence People (1936), but this quotation is not found in Carlyle's known works. The first mention found in Google Books dates from 1908, where the Rev. John Timothy Stone https://en.wikipedia.org/wiki/John_Timothy_Stone is quoted as claiming: 'The greatest critics of this world have been appreciators. Carlyle said, "You can discover a great man, or see a great man, by the way he treats little men.'
The quotation is subsequently found in slightly different forms, mostly in religious publications: "A great man shows his greatness by manner in which he treats little men" (1913, unattributed); The exact wording of Carnegie's quote suggests that it was taken from Stone's 1930 publication.
Disputed

https://twitter.com/BrarTiffany/status/976759180936740864

Source: The New Ethics (1907), Silent Martyrs of Civilization, p. 64

Source: The 7 Habits of Highly Effective People