We should support whatever our enemies oppose and oppose whatever our enemies support.
凡是敵人反對的，我們就要擁護；凡是敵人擁護的，我們就要反對。 (Fánshì dírén fǎnduì de, wǒmen jiù yào yǒnghù; fánshì dírén yǒnghù de, wǒmen jiù yào fǎnduì.)
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Notes from Wikiquote
Chapter 2, originally published in Interview with Three Correspondents from the Central News Agency, the Sao Tang Pao and the Hsin Min Pao (September 16, 1939), Selected Works, Vol. II, p. 272.