We are all amply provided, with moral maxims, which we hold with more or less confidence, but an insight into their significance is not attained without reflection and some serious effort. Yet, surely, in a field in which there are so many differences of opinion, clearness of insight and breadth of view are eminently desirable. It is with a view to helping students of ethics in our universities and outside of them to a clearer comprehension of the significance of morals and the end of ethical endeavor, that this book has been written. I have, in the Notes appended to it, taken the liberty of making a few suggestions to teachers, some of whom have fewer years of teaching behind them than I have. I make no apology for writing in a clear and untechnical style, nor for reducing to a minimum references to literatures in other tongues than our own. These things are in accord with the aim of the volume.