Philosophical progress changes what we take to be "intuitively" obvious, and this change covers up the tracks of the laborious arguments that preceded the changes. We don't see these changes, because we see with them.
Rebecca GoldsteinDoes God have a reason for wanting us to be charitable, to take care of those who can't take care of themselves? Either God does or God doesn't, it's just logic. If God has a reason then there is a reason independent of God and whatever God's reason is we should figure it out for ourselves. There is a reason and God doesn't really ground morality at all. God wants us to give charity because it's the right thing to do.
Rebecca GoldsteinFrom the beginning philosophy sought for The order behind the disorder Thales sipped cheap wine And in this did divine: "Why it's nothing at all but pure water!"
Rebecca Goldstein