“Having staved off disaster by force of arms, the West had somehow come to the idea that principle, rather than force, was a better basis for peace. The trouble was, publics took an "either/or" attitude toward the question: few stated that force without principle was sterile, but that principle without force behind it was powerless. The great trouble with classic liberal thought and classic liberals is that they have no trouble conceiving principle, but enormous trouble understanding how it must be implemented.”
Book:This kind of peace