262 For here Our concern is with the doctrine of the Catholic and Apostolic Church. She is the Mother and Teacher of all nations. Her light illumines, enkindles and enflames. No age but hears her warning voice, vibrant with heavenly wisdom. She is ever powerful to offer suitable, effective remedies for the increasing needs of men, and the sorrows and anxieties of this present life. Her words re-echo those of the Psalmist of old—words which never fail to raise our fainting spirits and give us courage: "I will hear what the Lord God will speak in me: for he will speak peace unto his people. And unto his saints: and unto them that are converted to the heart. Surely his salvation is near to them that fear him: that glory may dwell in our land. Mercy and truth have met each other: justice and peace have kissed. Truth is sprung out of the earth: and justice hath looked down from heaven. For the Lord will give goodness: and our earth shall yield her fruit. Justice shall walk before him: and shall set his steps in the way." (64)
Source: Mater et Magistra (Vatican.va)