"Interest is the barometer of the state."

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Children, like dogs, have so sharp and fine a scent that they detect and hunt out everything--the bad before all the rest. They also know well enough how this or that friend stands with their parents; and as they practice no dissimulation whatever, they serve as excellent barometers by which to observe the degree of favor or disfavor at which we stand with their parents.

— Johann Wolfgang von Goethe