First of all, what is the position of him who seeks an ethical philosophy? To begin with, he must be distinguished from all those who are satisfied to be ethical sceptics. He _will_ not be a sceptic; therefore so far from ethical scepticism being one possible fruit of ethical philosophizing, it can only be regarded as that residual alternative to all philosophy which from the outset menaces every would-be philosopher who may give up the quest discouraged, and renounce his original aim. That aim is to find an account of the moral relations that obtain among things, which {185} will weave them into the unity of a stable system, and make of the world what one may call a genuine universe from the ethical point of view. So far as the world resists reduction to the form of unity, so far as ethical propositions seem unstable, so far does the philosopher fail of his ideal. The subject-matter of his study is the ideals he finds existing in the world; the purpose which guides him is this ideal of his own, of getting them into a certain form. This ideal is thus a factor in ethical philosophy whose legitimate presence must never be overlooked; it is a positive contribution which the philosopher himself necessarily makes to the problem. But it is his only positive contribution. At the outset of his inquiry he ought to have no other ideals. Were he interested peculiarly in the triumph of any one kind of good, he would _pro tanto_ cease to be a judicial investigator, and become an advocate for some limited element of the case. There are three questions in ethics which must be kept apart. Let them be called respectively the _psychological_ question, the _metaphysical_ question, and the _casuistic_ question. The psychological question asks after the historical _origin_ of our moral ideas and judgments; the metaphysical question asks what the very _meaning_ of the words 'good,' 'ill,' and 'obligation' are; the casuistic question asks what is the _measure_ of the various goods and ills which men recognize, so that the philosopher may settle the true order of human obligations. I.