In disagreement with the Athanasian Creed?

Hi there,

has anyone of you ever discussed the Athanasian Creed with any of our trinitarian brothers and sisters? Is that creed accepted within our official church? I ask because the creed states that the three persons exist within the one indivisible essence (or substance) of God. And Ellen White once wrote the following: "The great Teacher [i.e. Jesus] held in His hand the entire map of truth. In simple language He made plain to His disciples the way to heaven, and the endless subjects of divine power. The question of the essence of God was a subject on which He maintained a wise reserve, for their entanglements and specifications would bring in science which could not be dwelt upon by unsanctified minds without confusion." {The Upward Look, p. 146}"

Which I would deem as impossible to put in line with the athanasian creed, right?