Disserationis huius finis est, R. M Harii doctrinam ethicam, quae in libris, quibus tituli The language of Morals (1952) et Freedom and Reason (1963) exponitur, et systematice proponere et critice interpretari. Haec doctrina, quamquam ob multa apte dicta magna attentione digna est, difficultatibus tamen gravibus expers esse non videtur. Praecipua harum difficultatum in hoc consistit, quod, unde principiorum seu praeceptorum moralium vis obligandi proveniat, auctor non prodit.

The article is a critical systematic presentation of R. M. Hare's ethical concepts and doctrine as outlined in his books The Language of Morals (1952) and Freedom and Reason (1963). The theory merits attention for many reasons, yet it appears to suffer from some weaknesses; the chief among them being the lack of explanation for the source of binding force of moral principles.