Dairy Queen CEO says he learned from Warren Buffett being the ‘smartest person in the world’ isn’t the most important attribute for success

Many businesses are birthed from a bright idea—but that isn’t enough to take a company big-time. Dairy Queen CEO Troy Bader said Warren Buffett taught him that zeal for the mission is more important than anything else; being “smartest person in the world” won’t outperform “somebody who has that passion.”

“Anybody you meet, I don’t care who they are—they know something you don’t,” Bader told Business Insider last year.

It’s just one of the two takeaways that have stuck with...