The most recent issue of Fortune has a good article on the power of good advice, and actually includes a number of insights from leading business moguls on the best advice they ever received.

Was thinking about the best personal advice I ever received: probably a three-way tie between my mom, my dad and St. Francis of Assisi. My dad's advice- "Never let someone out work you." My mom- "present yourself with excellence, including your appearance, your cleanliness (cleaning behind your ears!), your clothing, and your words." And St. Francis- "Preach the Gospel at all times, and if necessary, use words." He actually didn't tell me this one in person, and could be used by many others.... But it is such a good statement I had to include it.

How about you? The best advice ever?