The Kingdom of God is Within You by Leo Tolstoy Chapter 6 Page 67

appears inevitable for us from its close connection with human nature and the whole constitution of the world. I should wish that war could be put off for the longest possible time. Nevertheless, the moment will come when we shall be forced to go to war. I am considering it at this moment from the standpoint of universal humanity, and making no reference to our misunderstanding with Germany — a most trivial incident in the history of mankind. I say that war is necessary and beneficial, since it seems one of the conditions of existence for humanity. War confronts us everywhere, not only war between different races and peoples, but war too, in private and family life.

It seems one of the principal elements of progress, and every step in advance that humanity has taken hitherto has been attended by bloodshed.