The 1960s were turbulent times and, in Europe, Catholics faced storms of radical change that left many weary or even cynical.

In 1969, one of Germany's rising theologians -- a liberal priest at Vatican II who then became a conservative -- was asked what he saw in the future.

"What St. Augustine said is still true -- man is an abyss; what will rise out of these depths, no one can see in advance," said Father Joseph Ratzinger, on German radio. "Whoever believes that the church is not only determined by the abyss that is man, but reaches down into the greater, infinite abyss that is God, will be the first to hesitate with his predictions."

Ratzinger's words grew in importance in 1977 when he became Archbishop of Munich and quickly became a cardinal. Then Pope John Paul II made him prefect of the Vatican's powerful Congregation for the Doctrine of the Faith, where his orthodoxy led liberals to call him "God's Rottweiler." In 2005, he became Pope Benedict XVI.

Catholics continue to ponder his 1969 words: "From the crisis of today the church of tomorrow will emerge -- a church that has lost much. … As the number of her adherents diminishes, so it will lose many of her social privileges. In contrast to an earlier age, it will be seen much more as a voluntary society, entered only by free decision. As a small society, it will make much bigger demands on the initiative of her individual members."

The future pope predicted a "crystallization" process creating a "more spiritual church, not presuming upon a political mandate, flirting as little with the left as with the right. … It will make her poor and cause her to become the church of the meek."

The retired pope celebrated his 95th birthday on April 16th -- Holy Saturday. During an earlier meeting with Jesuits, Pope Francis called his predecessor "a prophet" and cited Benedict's predictions of a "poorer" and "more spiritual" church..

“Let us prepare ourselves to be a smaller church," said Pope Francis, in remarks published in a Jesuit journal. "This is one of his most profound intuitions."