The Golden Rule is an ethical, Humanist principle that existed long before Christianity or any other religion.
The GR is a fundamental precursor to a functioning society. As societies by necessity existsed before Christianity et al, the rule must have existed. Christianity (and doubtless other religions) then wrote it down and pretended they thought of it. It is this ridiculous notion that promotes the laughable (and demonstrably false) presumption that religion is the root of morality.
My point in the original post was that as a rule of thumb intentionally directed at the Apostles, the Golden Rule has a very specific foundation that was not proposed in precursor societies.
The fundamental principle that Jesus stipulates as the “content” of Christian ethical beliefs added onto the form ( the Golden Rule ) was for them, in Jesus’ words, to “Love as I have loved you.” That sets the baseline ethical standard for the Apostles because it establishes the context for the conditional in the GR: ”as you would have them do to you." That is, they are to love in the same way that Jesus loved them, which then becomes the way they are to love others via the GR. This is further expanded under, “Greater love has no one than this: to lay down one’s life…” and also “You must love your enemies as yourself.”
If we accept your claim that other cultures came up with the rule prior to Christianity or Judaism, as an “ethical humanist” principle, it amounts to no more than a very simple logical principle, “Treat like things (or humans) alike.” Which says nothing concerning “how” to treat them unless how to treat “oneself” is clearly stipulated.
The problem, as pointed out in my original two or three posts, is that the GR can’t be a “fundamental moral principle” because it doesn’t specify how you SHOULD treat yourself and THAT fully depends on the nature of “oneself.”
Without that specification, it is insufficient as a moral principle. Certainly, it is a fundamental logical principle, “Treat like things alike,” but since it fails to specify how to treat oneself to begin with, it is woefully lacking as a foundational moral principle.
As it is, it cannot be the foundation of any culture’s ethics, it can only serve as a rule of thumb after specifying how you would want to be treated and under what conditions.
As foundational principles, I know of no other cultures that set the standard for how to love oneself. Jesus does with “…as I have loved you…” and since Jesus gave up his life for the sake of all humanity, that would mean being willing to forfeit one’s own life for others, including, ostensibly one’s enemies.
In case you missed the logic…
- We are to love others as Jesus loved us.
Love one another. As I have loved you, so you must love one another. (John 13:34)
- “Others” includes our enemies.
You have heard that it was said, ‘Love your neighbor and hate your enemy.’ But I tell you, love your enemies and pray for those who persecute you, (Matt 5:43)
Therefore, our standard for “Do unto others…” is to love them as Jesus loved us, even our enemies. That is even to the point of giving up one’s life when necessary.
This creates the foundation for the “rule of thumb” (the Golden Rule) that gives no indication, on its own, as to what treatment I ought to accord myself, before applying that to others.
As I said before, “Treat like things alike,” the logical precursor for “Do unto others,” says nothing about how to treat things (or humans,) just to treat them the same.
Without the “how” stipulation, the Golden Rule is empty. All form and no substance. So the fact that it existed prior to Christianity isn’t much of a claim.