This paper discusses the relevance in Ethics of the notion of human being. It distinguishes between the sphere of real moral moral practices and the philosophical foundation of such practices. It discusses also the difference between the modern concept of person and that of human being and establishes their role in moral thought. Finally, it focuses on the classical concept of person.

This paper attempts to establish an articulation of ethics, logic and philosophy of psychology in the Tractatus. After showing the ethical purpose of the Tractatus, his picture theory of meaning, and his philosophy of psychology –stressing the role of projection– Arregui sets him-self the task of analyzing the mystical. His insistence on projection allows him to underline the function of the transcendental subject and, therefore, to offer an interpretation of the texts about the mystical, dif-ferent to the usual ones.