"Philosophy is such an impertinently litigious lady that a man had as good be engaged in lawsuits as have to do with her."

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Here is the prime condition of success: Concentrate your energy, thought and capital exclusively upon the business in which you are engaged. Having begun on one line, resolve to fight it out on that line, to lead in it, adopt every improvement, have the best machinery, and know the most about it.

— Andrew Carnegie