Money-Kyrle tries in this paper to use Freud's psychoanalysis (and Melanie Klein's modification of Freud's psychoanalysis) in order to develop prolegomena for a system of ethics. His ideas are not convincing to a relativistic scientist to whom morality is but a mental phenomenon within human minds, to be investigated in the same way as other mental phenomena. Psychoanalytic understanding of the genesis of pathological ideological attitudes does not enable us to come to a definition of 'normal' ideals. Money-Kyrle, however, thinks that this is possible, and that the normal ideal consists in a militant constructiveness, able to judge the world objectively and truthfully. The three fundamental principles of such Freud-Klein-Money-Kyrle morality, which Money-Kyrle believes to be empirical, are: 'It is bad (immoral, that is, it arouses guilt) to threaten or injure a good object; it is good (moral) to love and repair a good object; it is also good (moral) to hate, attack and destroy a secondary bad object in the defense of a good one'.