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Napoleon Hill's analogy of wealth is the best example I've read.
It goes;
"money is as shy and elusive as the maiden.
It must be wooed and won by methods not unlike those used by a determined lover
in pursuit of the girl of his choice.
That power when successfully used in the pursuit of money,
must be mixed with faith.
It must be mixed with desire.
It must be mixed with persistence.
It must be applied through a plan,
and that plan must be set into action.
Poverty needs no plan.
It needs no one to aid it,
because it is bold and ruthless.
Riches are shy and timid.
They have to be attracted."