Nothing is more instructive about the genuine value of generalization in conduct than the errors of Kant. He took the doctrine that the essence of reason is complete universality (and hence necessity and immutability), with the seriousness becoming the professor of logic. Applying the doctrine to morality he saw that this conception severed morals from connection with experience. Other moralists had gone that far before his day. But none of them had done what Kant proceeded to do: carry this separation of moral principles and ideals from experience to its logical conclusion. He saw that to exclude from principles all connection with empirical details meant to exclude all reference of any kind to consequences. He then saw with a clearness which does his logic credit that with such exclusion, reason becomes entirely empty: nothing is left except the universality of the universal. He was then confronted by the seemingly insoluble problem of getting moral instruction regarding special cases out of a principle that having forsworn intercourse with experience was barren and empty. His ingenious method was as follows. Formal universality means at least logical identity; it means self-consistency or absence of contradiction. Hence follows the method by which a would-be truly moral agent will proceed in judging the rightness of any proposed act. He will ask: Can its motive be made universal for all cases? How would one like it if by one's act one's motive in that act were to be erected into a universal law of actual nature? Would one then be willing to make the same choice? Surely a man would hesitate to steal if by his choice to make stealing the motive of his act he were also to erect it into such a fixed law of nature that henceforth he and everybody else would always steal whenever property was in question. No stealing without property, and with universal stealing also no property; a clear self-contradiction. Looked at in the light of reason every mean, insincere, inconsiderate motive of action shrivels into a private exception which a person wants to take advantage of in his own favor, and which he would be horrified to have others act upon. It violates the great principle of logic that A is A. Kindly, decent acts, on the contrary, extend and multiply themselves in a continuing harmony.