In the
2e City of Greyhawk boxed set it gets kind of close to a TN for Mordenkainen and the Circle of Eight with a pragmatic reason of worrying about most anyone, including good individuals and kingdoms, getting too much power.
The majority of the members of the Circle of Eight are of pure neutral alignment, and do not revere one deity to the exclusion of others. Their actions are usually directed toward preventing any country, faction, or organized group from growing too powerful and overwhelming others, spreading a growing influence across the lands of Oerth. The history of this young world has taught them that great dominance arising from any quarter leads to great wars, hubris which may draw down the wrath of one or more deities, or even greater disasters.
Power has corrupted the once good and great, as well as making the evil more ruthless and bloody in their rulership. If the actions and plans of the members of the Circle of Eight are more often directed to thwarting evil than good, this is because it is more often the evil powers of Iuz, the Hierarchs of the Homed Society, and others which seek conquest and dominion over the heartlands of Oerth. Opposition to evil humanoids (the Circle is fairly humanocentric) and magical research are further shared goals.
Worth noting though that Gygax was already years out of the picture when this view of Mordenkainen and the Circle of Eight was published in 89.