said Benjamin Franklin, apparently. It speaks to me at the moment, as does Oscar Romero's admonition to us to "aspire not to have more, but to be more".
I think lots of people might argue this is a feature of modern, capitalist, aspirational society and part of how we got our economy into such a state. I don't necessarily disagree - and I don't want to lose the moral challenge to an assumption that consuming more will make me/things 'better'. I used to have the postcard above on my bedroom door as a teenager, it's now framed and shortly to go on the wall of my grown-up house.
But I do also think that wanting more than we have (and more than we think we can get) has been a powerful force for change, and often for making things better, easier, fairer.