October 21

…three years before the outbreak of the world war ‘Abdu’l-Bahá travelled to America and most of Europe, where he raised His voice before all gatherings, societies and churches, appealing: O ye assemblage of men! The continent of Europe hath virtually become an arsenal filled with explosives. There are vast stores of destructive material hidden underground, liable to burst forth at a single spark, causing the whole earth to quake. O ye men of understanding! Bestir yourselves that perchance this accumulation of volatile material may not explode. But the appeal went unheeded and consequently this murderous war broke out. 

- ‘Abdu’l-Baha  (From a Tablet; ‘Additional Tablets, Extracts and Talks’; Online Baha’i Reference Library, Baha’i World Centre)