 We can overcome the sin like Christ did. He was an example. And I think a person can argue that in prophecy that he couldn't have sinned because it was prophesied that he would not. It was prophesied that he would be the perfect sacrifice. So you could say in that sense that it was prophesied that he couldn't. But I don't think that Jesus was walking around thinking he could not sin. Because then he would have never been tempted.