He wrote numerous books on theology, ideology, faith, hermeneutics, and social justice, and was an outspoken critic of what he perceived as Church callousness toward oppression and suffering.
He returned to Uruguay and in Montevideo he started "Cursos de Complementación Cristiana", in which he analysed political, social and economic problems in the light of Catholic faith.
With his experience in the Center, Segundo wrote his fundamental work, Teología abierta para el laico adulto, (Open Theology for the Lay Adult) in five volumes, published in Argentina by the Editorial Carlos Lohlé.
In fact, his prominent book The Liberation of Theology, was a series of lectures that took place in 1974 at Harvard Divinity School.
[1] In 1974 he had the distinction of "Best Book in 1974 Liturgy" of the Catholic Press Association of New York for The Sacraments Today, vol.