"I have had the same experiences with other peoples, whose psychology is strange to the whole body of our nation. How well it is that science is making a successful advance toward giving different countries a knowledge of each other! It is so dull to have only strangers around us in every place on earth, when we are brothers, all coming from one source The soul is the same, the habits are different. (October 1912 letter)"
January 1, 1970
https://en.wikiquote.org/wiki/Catherine_Breshkovsky