“Legal rights can be determined with precision by authority, but questions of ethical propriety have always been, and will always be, the subject of honest difference among honest men. The effect of exercising the jurisdiction which these decisions have asserted and defined is to deprive the creditors of money which is divisible among them by law. I feel sure that such a power should not be used unless the result of enforcing the law is such that, in the opinion of the Court, it would be pronounced to be obviously unjust by all right-minded men.”