The critical analysis of the truth of moral propositions in the light of the explanation of human acts

The destiny of many issues in the moral philosophy is tied to this subject namely the truth of moral propositions. There are two main theories about it; some believe that the universal principles of ethics reflect the external world and the others deny that. Conflictions between these scholars have been continued intensively, to now. According to the author, this problem in moral philosophy will be solved basically by Anthropology. In the other word, for the proponents of the reflective moral propositions, only will be two options: 1) they have to show that the ethical issues can also be resolved without discussing on the reflective elements. 2) Or at least they need to explain that the non-reflective elements must be ignored in the moral general principles. Therefore, for judging appropriately between these two groups, should be discussed on two affairs: "the necessity of abstractive perceptions" and " the criteria of derivation" .The other group, in the light of the explanation of voluntary human actions, proves that above mentioned ways are blocked. Firstly, human actions cannot be explained without believing in derivative perceptions, secondly, ethical propositions, particularly the universal principles, have standard of the derivation, therefore they are abstractive and non-reflective.