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He that fails in his endeavors after wealth or power will not long retain either honesty or courage.

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Courage is the greatest of all the virtues. Because if you haven't courage you may not have an opportunity to use any of the others.

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Courage is a quality so necessary for maintaining virtue that it is always respected even when it is associated with vice.

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[C]ourage is reckoned the greatest of all virtues; because, unless a man has that virtue, he has no security for preserving any other.