…not all things said of God betoken His essence. For what belongs to the category of relation is also predicated of Him, and this is relative and refers to relationship with something else, and does not signify essence. Such is the divine energy in God. For it is not essence, nor an accident, even though it is called a kind of accident by some theologians, who mean to say simply this, that it is in God and that it is not essence.
~St Gregory Palamas (Philokalia vol.4, p.406)