Musar sobre Habacuque 3:8

This also explains a very strange statement on this portion in Bereshit Rabba 68,9. Rabbi Hunna in the name of Rabbi Ami is quoted as saying that the reason the name of G–d is מקום, Place, is that He is the "Place" of the world and the world is not His "place." Rabbi Yitzchak comments by citing Deut. 33,27: מעונה אלוקי קדם, "Eternal G–d is a dwelling place." He asks: "Do we not know that G–d is the "place" of the world and not vice versa from the verse in Psalms 90,1: אדנ-י מעון אתה היית לנו, "O Lord You have been our place of refuge?" How then can the Torah describe the world as being His place?" Rabbi Aba son of Yudan answers by comparing G–d to a knight riding a horse. The rider's equipment surrounds him from all sides. In such a situation the horse is incidental to the knight -and not vice versa. This is proved in scripture by Chabakuk 3,8: "When You are riding on Your steed." Thus far the Midrash.