I. If we ask more particularly what Ethics is, definition affords us some light. It is to Aristotle that we are indebted for the earliest use of this term, and it was he who gave to the subject its title and systematic form. The name _ta ethika_ is derived from _ethos_, character, which again is closely connected with _ethos_, signifying custom. Ethics, therefore, according to Aristotle is the science of character, character being understood to mean according to its etymology, customs or habits of conduct. But while the modern usage of the term 'character' suggests greater inwardness than would seem to be implied in the ancient definition, it must be remembered that under the title of Ethics Aristotle had in view, not only a description of the outward habits of man, but also that which gives to custom its value, viz., the sources of action, the motives, and especially the ends which guide a man in the conduct of life. But since men live before they reflect, Ethics and Morality are not synonymous. So long as there is a congruity between the customs of a people and the practical requirements of life, ethical questions do not occur. It is only when difficulties arise as to matters of right, for which the {11} existing usages of society offer no solution, that reflection upon morality awakens. No longer content with blindly accepting the formulae of the past, men are prompted to ask, whence do these customs come, and what is their authority? In the conflict of duties, which a wider outlook inevitably creates, the inquirer seeks to estimate their relative values, and to bring his conception of life into harmony with the higher demands and larger ideals which have been disclosed to him. This has been the invariable course of ethical inquiry. At different stages of history--in the age of the Sophists of Ancient Greece, when men were no longer satisfied with the old forms of life and truth: at the dawn of the Christian era, when a new ideal was revealed in Christ: during the period of the Reformation, when men threw off the bondage of the past and made a stand for the rights of the individual conscience: and in more recent times, when in the field of political life the antithesis between individual and social instincts had awakened larger and more enlightened views of civic and social responsibility--the study of Ethics, as a science of moral life, has come to the front. Ethics may, therefore, be defined as the science of the end of life--the science which inquires into its meaning and purpose. But inasmuch as the end or purpose of life involves the idea of some good which is in harmony with the highest conceivable well-being of man--some good which belongs to the true fulfilment of life--Ethics may also be defined as the science of the highest good or _summum bonum_.