There may be conflict of purely impersonal ideals. How are we to decide between the two except by means of our own desires? Yet, if there is nothing further, an ethical disagreement can only be decided by emotional appeals, or by force - in the ultimate resort, by war. On the questions of fact, we can appeal to science and scientific methods of observation; but on ultimate questions of ethics there seems to be nothing analogous. Yet, if this is really the case, ethical disputes resolve themselves into contests for power - including propaganda power.p. 116.