It was here that he first met Cardinal Woytyla and worked with him in writing various works, papers and documents including "Gaudium et Spes", "Lumen gentium", "Dei verbum" and "Dignitatis humanae".
Gaudium et Spes, the Pastoral Constitution on the Church in the Modern World, was one of the principal documents of the Second Vatican Council.
One of the cardinals, Leo Joseph Suenens of Belgium, urged the council to take on social responsibility for Third World suffering, International peace and war, and the poor.
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Marie-Dominique Chenu, famed professor of the Pontifical University of Saint Thomas Aquinas, Angelicum was influential in the composition of Gaudium et spes.
He was involved with the drafting the documents Gaudium et Spes, an influential voice in the crafting of Populorum Progressio and a founder of the Économie et Humanisme (Economy and Humanism) movement.