I take umbrage with your remark "We own nothing..." But I'm sure you mean it in terms of the stuff of life - possessions upon a brief reflection.

Nevertheless what we do own or could choose to own is "the debt of our existence". We often, as modern citizens, don't think about the priveleges given us from the the labors of the people and the systems of societies, governments, economies and the natural resources that have preceeded us and are with us now,