We must repeat once more that the superfluous wealth of the rich countries should be placed at the service of poor nations. The rule up to now held good for the benefit of those nearest to us, must today be applied to all the needy of the world. Besides, the rich will be the first to benefit as a result. Otherwise their continued greed will certainly call down upon them the judgement of God and the wrath of the poor, with consequences no one can foretell.
– Paul VI, Populorum Progressio