Warren Buffett–“Live your Life by an Inner Scorecard”

“It’s very important,” said Buffett, “always to live your life by an inner scorecard, not an outer scorecard.”

What does that mean?
 

Buffett illustrated this by asking: “Would you prefer to be considered the best lover in the world and know privately that you’re the worst—or would you prefer to know privately that you’re the best lover in the world, but be considered the worst?”