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1 " Among peoples who possess a highly developed pugnacious instinct we find the greatest progress in the arts, sciences, social and political organization, commerce and industry. The instinct takes the milder form of rivalry which is the motive force of the great portion of the serious labors of mankind. "
― , An Introduction to Philosophy
2 " I think the motive force of all our action is, after all, personal happiness. "
― Leo Tolstoy , Anna Karenina
3 " The people, and the people alone, are the motive force in the making of world history. "
