Assalaam Alaikum Wa Rahmatullahi Wa Barakatuh,
Scholar Bediuzzaman Said Nursi explains the meaning of rukoo and sujud in prayer on 9 th word of Risale-i Nur:
...Then he bows, and through declaring together with all the universe his weakness and impotence, his poverty and baseness before the infinite majesty, the limitless power, and utter mightiness of the Enduring Eternal One, he says: All glory to My Mighty Sustainer (Subhane rabbiyel azeem!), and glorifies his Sublime Sustainer. And prostrating before the undying Beauty of His Essence, His unchanging sacred attributes, His constant everlasting perfection, through abandoning all things other than Him, man proclaims his love and worship in wonder and self-abasement. He finds an All-Compassionate Eternal One. And through saying, All glory to my Exalted Sustainer (Subhane Rabbiyel A'la!), he declares his Most High Sustainer to be free of decline and exalted above any fault.