Paul Manata in the comment stream of this post:
God does what he pleases, correct... BUT he has a nature that constraines what he pleases.... SO you can't take that verse to imply that God could, say, sin...SINCE there's a limit set on what he can please to do...THUS it is true that God does what he pleases but this doesn't lead to arbitrainess as your enthymeme suggested.So, who sets this "limit", Paul? Did God please to set his own limit, or has God submitted to external limits?