'Heights' in the Bible

(Now this expression, “He ascended,” what does it mean except that He also had previously descended [from the heights of heaven] into the lower parts of the earth?

So remember the heights from which you have fallen, and repent [change your inner self—your old way of thinking, your sinful behavior—seek God’s will] and do the works you did at first [when you first knew Me]; otherwise, I will visit you and remove your lampstand (the church, its impact) from its place—unless you repent.