I was just reading about + Elizabeth Seton and one of her big concerns was, "First: we should do what God wants, second: we should do it in that manner in which He wants it done and third (here's the kicker) We should do it because it is His will."
Here her standard is obedience, not because it's good for you to exercise and eat well (though it is) but because God wills it. Our obedience comes from our Love (which comes from grace and all that, but that's another part of the discussion.)
Anselm is saying that God the Fathers plan was essentially to acquiesce to the will of the Son, who agreed to do the Fathers will.
Okay, treat me like the idiot I am, please. Is it as though there were this conversation:
Father: I want to save the WORLD.or is it, more like:
Son: Well, I want what you want, whatever it is.
Father: Well I think the way we do it is You die for their sins.
Son: Okay.
Father: I want to save the WORLD.Or is this just so off base that I should go out and jump off a cliff?
Son: Well, I want what you want, whatever it is, and if you wanted me to die for their sins, I'd even do that.
Father: Well then, I think that's the way we're going to do it. We'll do it that way.
I can understand Anselms viewing Christs sacrifice as an act of obedience. I think this is correct from Christs humanity side. However, Christs divinity side was the will of the Father, both who felt the Son must be sacrificed. I believe Anselm may have been looking at the humanity of Christ while not giving due consideration to His deity. Anselms statement that God the Father didnt compel the Son to die raises the question of whether God the Father needs to compel anyone to do His will.
This is a very fine point but Anselms argument seems to hinge on this concept.
I would say that Christ not only knew the Fathers will but it was His will as well. The wills are the same. This is what makes God ONE, while being three. God loves the Son because they are the same holiness, same thought, same will. Just don't ask me much more about the Trinity or I will go crazy.