For sentimental pacifism is, after all, but a return to the method of the jungle. It is in the jungle that emotionalism alone determines conduct, and wherever that is true no other than the law of the jungle is possible. For the emotion of hate is sure sooner or later to follow on the emotion of love, and then there is a spring for the throat.

Robert Millikan, "Science and modern life", The Atlantic Monthly, April 1928, Quoted in Understanding Poetry, 3rd edition, 1960.