There are so many things & events in our lives whose foundations are based on literature or folk lore and with the passing of time we have started considering them truths. Let me give you an example:
Whenever someone mentions Christmas the image that conjures up in our mind is of roads & houses in the western world buried in snow. This concept of White Christmas is also popular there and everyone waits for snow during Christmas. But how did this concept came about. The man credited to have started this was none other than Charles Dickens. The reason behind this was that during his childhood there was a decade of unusually cold weather and London had in a row snow on Christmas that is why in all his books it is always snowing during Christmas. Moreover during the winter of 1813-1814 the whole of Thames was frozen and they actually had fairs & bonfires on the frozen river.
The matter of fact is it only snowed 4 times in the 20th century during Christmas & it has snowed a little more in the 21st century.
That is why they say the pen is mightier than the sword.