Dear Doing,
Morals that transcend our existence, are intrinsically beyond our ability to determine. Even with Divine Revelation, we cannot say that something beyond our recognition is moral. (Such as how gods treat each other.) Because it is beyond our dimension, we could never grasp the moral of it.
However, things that are within the sphere of our individuality, we can and must define an ethic for it. (For example, what lengths to go to on personal hygiene.) We would not be able to cultivate ourselves without it. As we develop into social circles and civilizations, the need arises for a common moral good. Such as being determined to avoid theft. This will be subjectively good, when it enhances the growth of society. But it is completely and objectively good at doing what it is intended to do; sustain the respect for other people’s property.
On this basis, Kant, Hegel, Locke, and who knows how many others, demonstrated that theft is bad because it leads to the ruin of civilization. Though it could be argued, that in if our view would transcend the small perspective of humanity, we might be convinced that the ruin of civilization is the ultimate good.