This is the kernel of the _Ethics_, and all the rest is subordinate to this main interest and purpose. Yet “the rest” is not irrelevant; the whole situation in which character grows and operates is concretely conceived. There is a basis of what we should call Psychology, sketched in firm outlines, the deeper presuppositions and the wider issues of human character and conduct are not ignored, and there is no little of what we should call Metaphysics. But neither the Psychology nor the Metaphysics is elaborated, and only so much is brought forward as appears necessary to put the main facts in their proper perspective and setting. It is this combination of width of outlook with close observation of the concrete facts of conduct which gives its abiding value to the work, and justifies the view of it as containing Aristotle’s Moral Philosophy. Nor is it important merely as summing up the moral judgments and speculations of an age now long past. It seizes and dwells upon those elements and features in human practice which are most essential and permanent, and it is small wonder that so much in it survives in our own ways of regarding conduct and speaking of it. Thus it still remains one of the classics of Moral Philosophy, nor is its value likely soon to be exhausted. As was pointed out above, the proem (Book I., cc. i-iii.) is a prelude to the treatment of the whole subject covered by the _Ethics_ and the _Politics_ together. It sets forth the purpose of the enquiry, describes the spirit in which it is to be undertaken and what ought to be the expectation of the reader, and lastly states the necessary conditions of studying it with profit. The aim of it is the acquisition and propagation of a certain kind of knowledge (science), but this knowledge and the thinking which brings it about are subsidiary to a practical end. The knowledge aimed at is of what is best for man and of the conditions of its realisation. Such knowledge is that which in its consumate form we find in great statesmen, enabling them to organise and administer their states and regulate by law the life of the citizens to their advantage and happiness, but it is the same kind of knowledge which on a smaller scale secures success in the management of the family or of private life.