Isaiah 45:6

Third, God chose Cyrus so everyone would come to know that He is the only true God. Note the progression in the reasons for Yahweh’s choice of Cyrus: that he might know, that Israel might know, and that the world might know who is the only true God. This is important, not because God has a huge ego, but because it is true and because only as people recognize Yahweh for who He is, that they will stop ruining their own lives with idolatry. God’s use of Cyrus preserved the Israelites and thus made the Incarnation possible. That event, in turn, has made salvation available to the whole world.