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When Andy Reid was the head coach of Philadelphia Eagles, he would send messages to Quarterback Donovan McNabb via Notecards. Reid called them nuggets. They were usually short, just a thought or a target or a few motivating words. They should not be life -changing.

“His thing was like, ‘I want to give you a little gold nugget’,” McNabb said. “Just something to take in.”

Reid was a young coach and he always wrote down ideas, a lesson from Bill Walsh or Winston Churchill who would find his way to a 3 x 5 card. Some of these cards went to McNabb. Others to coaches. But one card in particular ended up behind Reid’s desk. It contained only two words, and two decades later it still gives the simplest understanding of Reid’s leadership.

“Don’t judge.”

With his 66 years, Reid is one of the most successful coaches in the NFL’s history: the fourth time ever in victories with 300; First in playoff appearances with 20; In third place with three Super Bowl championships, with its Kansas City Chief’s two wins from the first three-peat in NFL’s history.

The essence of that success is a straightforward management style that has guided players and affected assistants, including his opponent on Sunday. (Buffalo Bill’s coach Sean McDermott is one of 11 former Reid assistants who become NFL head coach.) It’s built on a simple premise: Don’t put people in a box. They may be surprised.

Read more about Reid’s successful coaching philosophy below.