For it is the bitter grief of theology and its blessed task, too, always to have to seek (because it does not clearly have present to it at the time)...always providing that one has the courage to ask questions, to be dissatisfied, to think with the mind and heart one ACTUALLY has, and not with the mind and heart one is SUPPOSED TO have.

Revised edition by J.  211). This means that in spite of their differences there is "an inner similarity and commonality" among things which forms a single world.

Karl Rahner SJ (March 5 1904 – March 30 1984) was a German Jesuit and theologian who alongside Henri de Lubac Hans Urs von Balthasar and Yves Congar is considered one of the most influential Roman Catholic theologians of the 20th century. Before the Second Vatican Council Rahner had worked alongside Yves Congar Henri de Lubac and Marie-Dominique Chenu theologians associated with an emerging school of thought called the Nouvelle Théologie elements of which had been condemned in the encyclical Humani Generis of Pope Pius XII.