Pope Benedict, elaborating his views on evolution for the first time as Pontiff, says science has narrowed the way life's origins are understood and Christians should take a broader approach to the question.
The Pope also says the Darwinist theory of evolution is not completely provable because mutations over hundreds of thousands of years cannot be reproduced in a laboratory.
But Benedict, whose remarks were published today in Germany in the book Schoepfung und Evolution, praised scientific progress and did not endorse creationist or "intelligent design" views about life's origins.
Those arguments, proposed mostly by conservative Protestants and derided by scientists, have stoked recurring battles over the teaching of evolution in the United States. Some European Christians and Turkish Muslims have recently echoed these views.
"Science has opened up large dimensions of reason ... and thus brought us new insights," Benedict, a former theology professor, said at the closed-door seminar with his former doctoral students last September that the book documents.
"But in the joy at the extent of its discoveries, it tends to take away from us dimensions of reason that we still need. Its results lead to questions that go beyond its methodical canon and cannot be answered within it," he said.
"The issue is reclaiming a dimension of reason we have lost," he said, adding that the evolution debate was actually about "the great fundamental questions of philosophy - where man and the world came from and where they are going."