Ezekiel 1:10 tells of the heavenly creatures with the faces of humans, eagles, lions, and oxen:
As for the likeness of their faces, they four had the face of a man, and the face of a lion, on the right side: and they four had the face of an ox on the left side; they four also had the face of an eagle. - Ezekiel 1:10
In John MacArthur's introduction summary of the book of Ezekiel he explains them as angels
"representing aspects of creation over which God rules"
as quoted here: http://www.gty.org/resources/bible-introductions/MSB26/ezekiel
My question is, if they do, what 4 aspects of creation do the faces represent?