“[One of the company… said: …is not this the direct contrary of what we admitted before—that out of the greater came the less and out of the less the greater, and that opposites are simply generated from opposites; whereas now this seems to be utterly denied. ] …then we were speaking of opposites in the concrete, and now of the essential opposite which, as is affirmed, neither in us nor in nature can ever be at variance with itself… these essetial opposites will never, as we maintain, admit of generation into or out of one another.”

Implementing the Land Reform (1958) (excerpts)

Everything Has to Do with Hardness and Softness (1969)

This was not Wordsworth's viewpoint at all. The words are in fact those of Bertrand Russell in his Sceptical Essays (1928), p. 157.
Misattributed

Yes.
Plato, Phaedo

Ma Ying-jeou (2013) cited in: " Time not right for political talks with China: Ma http://www.taipeitimes.com/News/front/archives/2013/10/26/2003575395" in Taipei Times, 26 October 2013.
Statement made to dismiss concern regarding ROC sovereignty under the fast-paced cross-strait development, 25 October 2013.
Other topics

Source: The Flame is Green (1971), Ch. 5 : Muerte De Boscaje
Context: Things are set up as contraries that are not even in the same category. Listen to me: the opposite of radical is superficial, the opposite of liberal is stingy; the opposite of conservative is destructive. Thus I will describe myself as a radical conservative liberal; but certain of the tainted red fish will swear that there can be no such fish as that. Beware of those who use words to mean their opposites. At the same time have pity on them, for usually this trick is their only stock in trade.

2010s, Europe at the Edge of the Abyss (2016)