What do you think makes Pip change his opinion of his benefactor Magwitch from one of the initial repugnance to one of the deep and abiding respect love?

In Part III, Chapter VII, Pip actually misses Magwitch and wants to be closer to him. He has learned about the criminal's past... his experiences, and we are reminded of a parrallel moment in the first chapter when young Pip looked back on the marshes he was running from and saw Magwitch walking away into the cold night. That singular figure on the horizon struck a sympathetic chord in young Pip and made the two of them unified in their abandonment by the world. Here, too, Pip has changed from fear (and disgust) of the convict, to sympathy and genuine companionship.