If that sounds oversubtle, or if the preacher's assumptions seem to beg the question, let us drop the pulpit jargon and look at the distinction as it works out practically in the lives of two highly useful members of society, the plumber and the college president. Suppose a plumber is called into your house on a raw day of January to tinker up a disordered pipe in the cellar. Probably that plumber is discontented; indeed, I cannot imagine how a plumber can be anything but discontented. Nevertheless, his discontent may be either one of two very different sorts. He may be grumbling to himself because he has to work at a cold and dirty job, while you are enjoying your newspaper up-stairs over a warm and cosey fire. In that case his discontent may take itself out in slighting his task and wasting your time and lengthening his bill. These things are said to happen. And he may even carry his discontent into a view of the organization of society which expresses itself in very hardy politics. But suppose now that his discontent takes another form. Imagine him content with his lot as a plumber, even proud of it, but dissatisfied with the common reproach of slackness and extortion, ambitious to excel in his profession. I do not cite such a plumber as a probability; but all things are possible in a Bross lecture. At any rate, such a paragon would be worthy of succeeding to that famous chair of the Harvard faculty once occupied by a gentleman whom the trustees hired as the Plumber professor of Christianity, but whom the undergraduates irreverently dubbed the Christian professor of plumbing.