"Human nature is such that people are born with a love of profit If they follow these inclinations, they will struggle and snatch from each other, and inclinations to defer or yield will die."

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The mind grows by self revelation. In play the child ascertains what he can do, discovers his possibilities of will and thought by exerting his power spontaneously. In work he follows a task prescribed for him by another, and doesn't reveal his own proclivities and inclinations; but another's. In play he reveals his own original power.

— Friedrich Frobel