(Devarim, Ibid. 26) "The Rider in the heavens is your help": When Israel is upright and does G-d's will — "the Rider in the heavens is your help"; but if it does not do G-d's will — "and in His pride (He inhabits) the heights."
All of Israel gathered unto Moses and said to him: "Moses, our teacher, what is the nature of Heavenly glory?" He answered: "From the terrestrial realm you may fathom the celestial."
This is comparable to one's saying "I want to see the king's countenance" and being told "Enter his province and you will see." He enters the province and sees a curtain spread over its opening studded with precious gems and pearls — whereupon he falls to the ground (in awe). At this they say to him: "Look, you could barely feast your eyes until you fell. If you had entered the province itself and beheld the face of the king, how much more so!" This is the intent of "and in His pride (He inhabits) the heights!"