This study discusses, from the example of Alija Izetbegović, what the legitimate instruments are that will enable us to talk about morality. Considering that a philosophical investigation will gain legitimacy by reason, one of the main areas of discussion of philosophy, the moral domain, needs to be discussed rationally. But can we use a method which we use in analyzing an objective structure which is current in nature, in the moral field which is the field of what should be? Modern philosophy has a methodological mistake that results in inconsistency in the discussion of the practical field of philosophy, like moral. In this context, Alija emphasizes the special fields of human experiences, such as art, religion and morality out of science.