This could well be a sign held by an Occupy Wall Street demonstrator:
Those things which some possess in excess of reasonable needs are owed by natural law to the sustenance of the poor.
The Catholic theologian who stated this? Thomas Aquinas, the "angelic doctor" who is often cited by the magisterium as the Catholic theologian of all time. The citation is from Aquinas' Summa Theologiae II.II, 66, art. 7.






