Epistemological issues in the moral argument

I am a proponent of a moral argument, taken from William Lane Craig, given in the following form:

  1. If God doesn’t exist, then objective moral values and duties don’t exist
  2. Objective moral values and duties do exist
  3. Therefore, God exists

I’ve had a number of previous posts here dealing with specific details of this argument’s defence. Here I wish to discuss a defence of the second premise that goes like this:

  1. In the absence of any defeaters, we are rationally compelled to trust the deliverances of our various faculties
  2. In our moral experience we perceive objective moral duties and values
  3. We have no defeater for these deliverances of our moral faculty
  4. Therefore, we are rationally compelled to believe in objective moral duties and values

Clearly, this argument falls in the realm of epistemology. Perhaps it will be helpful to clarify a few terms for those who aren’t familiar with them.


First, some examples of the various faculties we have are our five senses, inductive reasoning, deductive reasoning, abductive reasoning[1], memory, and our moral sense. I suppose I should probably explain those three reasoning faculties a little more. Deductive reasoning uses principles of logic that seem to be objectively binding, like the principle of excluded middle (for any proposition A, A is either true or false), the principle of non-contradiction (for any proposition A, it is not possible for both A and not-A to be true at the same time), the validity of certain reasoning schemes (like, if A entails B, and A is true, then B is true), and so on. Our deductive reasoning faculty is that part of us that perceives that certain principles are true and others false, how to apply these general principles to specific examples, and so on. For example, I hope that everyone reading this will see that the examples I gave of logical principles are self-evidently true[2].

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Derivative Divine Command Theory

While I was having a discussion in the comments here it dawned on me that I might’ve stumbled upon a novel Divine Command Theory (DCT). Before I get there I should probably give a brief description of what a DCT is. DCT is a meta-ethical theory that seeks to ground our moral duties in the commands of God. To ground our duties involves giving a basis for them. So when asked, “why ought I be loving to my neighbour” the divine command theorist will answer, “because God has commanded that you ought be loving to your neighbour”.

This isn’t just a silly case of “because God said so”, for it properly applies how we see duties arise elsewhere to our moral duties: duties arise from commands from qualified authorities. To ground this intuition for you take an example of legal duties. If you’re driving your car down the road and a random person tells you to pull over to the side, you have no obligation to do so. In this case, you have a command, but no authority. Now if a policeman tells you to pull your car over, then you have a legal obligation to do so. This is because the policeman is a legal authority, so in this case you have a command and an authority.

Euthyphro and Essentialism

Now the divine command theorist will say that God is a qualified moral authority (reasons for are discussed later) and so his commands issue moral duties binding on us. Almost certainly, when one starts talking about DCT someone in the discussion is going to bring up the Euthyphro Dilemma. This dilemma arises from one of the Socratic Dialogues written by Plato (it’s called “Euthyphro”, if you were interested), in which Socrates asks Euthyphro, “Is something right because God commands it, or does God command it because it is right?”[1]

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Which Came First: Right or Law?

I was thinking about the law today, as people do, and I was wondering which of the following two categories serves to ground the other:

  1. Inherent human rights, value or dignity (we’ll just call this “value”)
  2. Human duties or law (we’ll just call this “law”)

By “duties” I mean [legal, moral and/or parental] obligations (what we “ought” do) and prohibitions (what we “ought not” do).

For example, consider the following questions and their plausible answers if value grounds law:

  • “Why shouldn’t we murder?” “Because human life is inherently valuable”
  • “Why should we have freedom of speech?” “Because humans have dignity and therefore deserve to have their opinions heard”
Alternatively, if you thought that duty grounds value then the questions and answers look something like this:
  • “Why is human life valuable?” “Because we have laws that preserve it”
  • “Why do humans have dignity?” “Because their opinions are protected by law”