Long story short, I have a key character in a story, who is poor but is a principled person and doesn't overvalue money. He feels money is used by the rich, like a bone to a dog to bend the poor to their will and if the poor learn to be contented with what they have or atleast not have an money at all cost attitude that is the best way to get self-respect. However as the story moves he becomes greedy and feels that he was wrong and that money is all important. I am struggling to find a convincing tipping point that would make this transition possible for him. Feel there need to be two three incidents which force this change of outlook. Please help outline potential issues which could be used to nudge the character and the narrative in this direction.