Jamieson, Fausset and Brown on Ezekiel 10:9

9. wheels--(See on Eze 1:15, 16). The things which, from Eze 10:8 to the end of the chapter, are repeated from the first chapter are expressed more decidedly, now that he gets a nearer view: the words "as it were," and "as if," so often occurring in the first chapter, are therefore mostly omitted. The "wheels" express the manifold changes and revolutions in the world; also that in the chariot of His providence God transports the Church from one place to another and everywhere can preserve it; a truth calculated to alarm the people in Jerusalem and to console the exiles [Polanus].