Aristotle said that to lead a "happy life," people should adhere to four cardinal virtues -- courage, justice, prudence and temperance. That's still good advice for modern business leaders, although it's also worth tacking on the Christian ideals of faith, hope and charity, writes Deb Mills-Scofield. A first step: "Take a project your leadership team is involved in and identify what virtues are most critical to the project's success," she writes.

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