"There are moments when our passions speak and decide for us ... like a fire kindled within our being to which everything else in us is mere fuel."

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Heat can also be produced by the impact of imperfectly elastic bodies as well as by friction. This is the case, for instance, when we produce fire by striking flint against steel, or when an iron bar is worked for some time by powerful blows of the hammer.

— Hermann von Helmholtz