It is a curious commentary upon the confusion of tongues which has descended upon us in our efforts to build towers reaching to Heaven, that you would have been misled had I given this address its true title. Had I called it “the Value of Purity” most of you would have imagined that I was going to speak of what is usually called--with such strange one-sidedness--the “social evil”; just as we call the liquor traffic “the Trade.” You would have thought, probably, that I was going to speak about Regulation 40 D, or some other aspect of the sex problem with which the word “purity” has become conventionally allied. It would, indeed, be one-sided in the other direction, to exclude such considerations from the scope of so embracing a theme; but my intention is rather to disencumber the word “purity” from the narrow and puritanical meaning to which it has become limited; and the “Salt of the Earth” does bring us nearer by its salutary implication to what purity should really mean. For if purity is not a good sanitary principle of fundamental application to all ethical problems alike, it is merely a pious fad which may easily become a pious fraud--a religious tenet pigeon-holed by crabbed age for the affliction of youth. To departmentalise it in a particular direction leads to impurity of thought; for we destroy the balance of life and degrade its standards if we do not use our moral weights and measures consistently in all relations alike. And if you allow a particular implication of purity to impose its claim in a society whose impurity in other directions makes it entirely impracticable, then you are reducing your social ethics to mere pretence and mockery; and honest youth will find you out, and will turn away from your religions and your ethical codes with the contempt which they deserve. Is not that what is actually happening--more apparently to-day, perhaps, than ever before? Has not that departmental code to which I refer broken down and become foolish in the eyes of honest men and women, largely because purity is nowhere established in the surrounding conditions of our social life?