First of all, he is clearly extremely talented. He has literally all the tools you would want in a franchise quarterback. But, the reason I think he will be so good in this league is actually his mindset. He is such a tenacious worker and an avid learner. He continuously seeks to get better as a player and as a leader.
In fact, this offseason, Justin Fields has shown up at Halas Hall when Bears players had the week off and wanted to put in work so he took trainers on the field and threw to them, Albert Breer reported a few days ago. This is yet another example that shows the type of person Fields is. Obsession beats talent every single time.
I expect big things from him moving forward and I know that he will not disappoint Bears Nation.