@adrian1
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I saw this topic a few days ago, but these types of things take some thought and reflection… and time, of course.
First, are good and evil separate substances? A lot of Gnostic religions proposed that they are. There is one God who is the source of all good, and there is something else which is the source of all evil, and that they are mutually exclusive. But that’s not what we profess. We profess that God is the creator of everything. The idea that there is this separate substance of evil that isn’t created by God but has its origin in something else, whether uncreated or created, is antithetical to monotheism.
It’s also common theological opinion among Catholics that evil is not a creation in itself at all, but a privation in some good that should be present. Let’s reflect more on that. If I have a triangle, is the triangle more good or less good the more closely it instantiates triangularity? A healthy dog has four legs. When a dog loses a leg, is that a good or is that a physical evil it has suffered? We generally say that a good is healthier, that is, more good in health, when it has four legs, when it’s immune system is healthy, etc . . . And that it has suffered an evil when it loses some functionality or feature that seems natural to being a dog (having four legs). Likewise with humans, we can of course speak of goodness in health. Goodness in morality is a similar concept, in which case when people are morally good when they act more in accordance with what we consider their “humanity” or “human nature,” and evil when they act contrary to what is fulfilling for a human being of healthy mind and body.
So the common theme here is that you have a triangle that is more good when it better instantiates being a triangle, a a dog in good health when it better instantiates what you expect from a healthy dog, and a morally good human when they act more in accordance with human nature. There is a relationship of goodness to the thing’s way of being. The better or more full it is (be’s, is being) in being what it is, the more good it is at being what it is. This isn’t exclusively a moral measurement, but it applies to human morality as well, as illustrated above. Goodness is convertible with being (these are two things that philosophers have traditional considered to be among the “trancendentals”).