Sometimes, it is the one thing that elevates a talented player to the level of the elite.
Tom Brady, who saw six quarterbacks taken before he was finally selected in the sixth round of the 2000 draft, has it.
So does new Bengals running back Mark Walton, who was Cincinnati’s fourth-round selection – 112th overall – in the 2018 NFL Draft.
Like everyone else, Walton is motivated to play well for himself. His father was murdered when he was only seven- or eight-years-old and is also motivated to play for his mother, who always believed in him.