Pope Pius XI: “No genuine cure can be furnished for this lamentable ruin of souls, which, so long as it continues, will frustrate all efforts to regenerate society, unless men return openly and sincerely to the teaching of the Gospel” (Quadragesimo Anno [1931: #136]).
“For there is no permanent city for us here on earth; we are looking for the city which is to come” (Hebrews 9:14).
From a UN publication (Social Justice in an Open World: The Role of the United Nations): “Present-day believers in an absolute truth identified with virtue and justice are neither willing nor desirable companions for the defenders of social justice” (pp. 2-3). [So much for Catholic Social Teaching!]