Why does the idea of progress loom so large in the modern world? Surely because progress of a
particular kind is actually taking place around us and is becoming more and more manifest.
Although mankind has undergone on general improvement in intelligence or morality, it has made
extraordinary progress in the accumulation of knowledge. Knowledge began to increase as soon as
the thoughts of one individual could be communicated to another by means of speech. With the
invention of writing, a great advance was made, for knowledge could then be not only communicated
but also stored. Libraries made education possible, and education in its turn added to libraries:
the growth of knowledge followed a kind of compound interest law, which was greatly enhanced by the
invention of printing. All this was comparatively slow until, with the coming of science, the tempo
was suddenly raised. Then knowledge began to be accumulated according to a systematic plan. The
trickle became a stream; the stream has now become a torrent. Moreover, as soon as new knowledge
is acquired, it is now turned to practical account. What is called 'modern civilization' is not
the result of a balanced development of all man's nature, but of accumulated knowledge applied to
practical life. The problem now facing humanity is:What is going to be done with all this knowledge?
As is so often pointed out, knowledge is a two-edged weapon which can be used equally for good or
evil. It is now being used indifferently for both. Could any spectacle, for instance, be more grimly
whimsical than that of gunners using science to shatter men's bodies while, close at hand, surgeons
use it to restore them? We have to ask ourselves very seriously what will happen if this twofold use
of knowledge, with its ever-increasing power, continues.