“Of the two contradictory aspects, one must be principal and the other secondary. The principal aspect is the one playing the leading role in the contradiction. The nature of a thing is determined mainly by the principal aspect of a contradiction, the aspect that has gained the dominant position. But this situation is not static; the principal and the non-principal aspects of a contradiction transform themselves into each other and the nature of the thing changes accordingly.”
On Contradiction (1937)
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Mao Zedong 181
Chairman of the Central Committee of the Communist Party of… 1893–1976Related quotes

On the Correct Handling of Contradictions Among the People
Original: (zh-CN) 敌我之间的矛盾是对抗性的矛盾。人民内部的矛盾,在劳动人民之间说来,是非对抗性的;在被剥削阶级和剥削阶级之间说来,除了对抗性的一面以外,还有非对抗性的一面。

Pedagogia do oprimido (Pedagogy of the Oppressed) (1968, English trans. 1970)

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"Creative aspect of language use"
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Molotov's report on (29 March 1940), after the Polish defeat, as quoted in the weekly Soviet newspaper Moscow News, published by Mezhdunarodnaya Kniga (1 April 1940)
Context: Germany, which has lately united 80 million Germans, has submitted certain neighboring countries to her supremacy and gained military strength in many aspects, and thus has become, as clearly can be seen, a dangerous rival to principal imperialistic powers in Europe — England and France. That is why they declared war on Germany on a pretext of fulfilling the obligations given to Poland. It is now clearer than ever, how remote the real aims of the cabinets in these countries were from the interests of defending the now disintegrated Poland or Czechoslovakia.

Source: Frames of Mind: The Theory of Multiple Intelligences., 1983, p.104

Source: 1900s, Notes d'un Peintre (Notes of a Painter) (1908), p. 410

“The ability to play is one of the principal criteria of mental health.”
Ashley Montagu (1981, p. 156), cited in: Thomas J. Sweeney (1989), Adlerian counseling: a practical approach for a new decade, p. 54