What is the principle or source that enables us to evaluate moral judgments, in other words, moral propositions as good or bad? It is possible to find different answers in the history of thought that this source is pleasure, nature, emotion, reason, intuition, society, and divine will. But where do I get that Justice is good and cruelty is bad? The answer we give to the question brings us face to face with different questions again. For example, if our answer is the mind, what is the characteristic of this mind or which mind is it? Do human nature, emotions, intuition play a role in the society's judgment of good and bad actions regarding actions? What is the role of divine revelation in determining the moral field? In this book, it is aimed to deal with such questions that can be multiplied in relation to moral judgments, mainly under the question of the source of moral propositions.