To be human is to make mistakes. It may also be a sin, but the two don’t necessarily go together. Then there’s intervention, which may make your mistake a fortunate mishap that leads to a whole lot of good.
When I was very young, that intervention was the doing of one of my parents or teachers, and when I was old, it usually was divine doing. Yes, I have made mistakes that were turned into a golden happening by God! (Who else could do it; I mean a mistake of the proportions that I made!)
And so the believer has the happy auxiliary of chance (Providence). The unbeliever gets anonymous gifts, too, but of none is he so aware as the believer. I’m sure Christ made mistakes, too, but he had the Father to make them right.