I used to know an extremely wealthy man [he is still alive - just haven't spoken to him in close to 30 years], one of the biggest baalei tzedaka in the Jewish world. He has a gizzilion dollars which he shares freely.
He once said: "The greatest gift that Hashem ever gave me is...... the seichel to realize that my money is not mine."
What is weird is that he actually lives that way.