In his last public address on 3 August 1879 he prophesied in an over-optimistic way, "In the twentieth century war will be dead, the scaffold will be dead, hatred will be dead, frontier boundaries will be dead, dogmas will be dead; man will live."
1879年8月3日，在他最后的公开演讲中，他做了过于乐观的预言：“二十世纪战争将消亡，绞刑架会废除，仇恨会湮灭，边界线会取消，教条会废止；人们会活下来。