"We might miss the sign or we may be unable to read the expression, but it is almost a contradiction in terms to say that a dog feels something but does not show it. What a dog feels, a dog shows, and, conversely, what a dog shows, a dog actually does feel."

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At certain times in the revolutionary struggle, the difficulties outweigh the favorable conditions and so constitute the principal aspect of the contradiction and the favorable conditions constitute the secondary aspect. But through their efforts the revolutionaries can overcome the difficulties step by step and open up a favorable new situation, thus a difficult situation yields place to a favorable one.

— Mao Zedong