Menicus has been taken as a great metaphysician. He developes a metaphysics of morality. His theory of mind as being originating from the Heaven, “Ti’en” is an essential part of the metaphysics and ethics. The problems of ethics can be solved form the metaphysics of mind. Hence, the students of Menicus mistakenly believe that the problem of moral choice will be dissolved, if one has a cultivation of the mind. The main topics of this paper are:1. The main concern of the author of Menicus is praxis rather than an establishment of meaphysics of mind.2. The Menicusian theory of mind is a foundation for the universality of moral principles and moral worth of moral actions.3. Menicus’s theory moral decision is founded upon the moral principles rather than that of mind or the conception of “Ti’en”.4. Menicus does not derive the principles of moral decision from the metaphysics of mind rather from the practical rules that were established from the “moral genuis” such as the ancient great kings, Yoa and Hsiung.5. Menicusian ethics is not a deontological ethics but a consequential one since he emphasizes the principle of the greatest unility.6. The way of re-vitalizing the philosophy of Menicus is consisted in a development of a theory of moral decision rather than the Neo-Confucian interpretations of the metaphysics of morals.