210 The almost limitless horizons opened up by scientific research only go to confirm this truth. More and more men are beginning to realize that science has so far done little more than scratch the surface of nature and reality. There are vast hidden depths still to be explored and adequately explained. Such men are appalled when they consider how these gigantic forces for good can be turned by science into engines of destruction. They realize then the supreme importance of spiritual and moral values, if scientific and technical progress is to be used in the service of civilization, and not involve the whole human race in irremediable disaster.
Source: Mater et Magistra (Vatican.va)